diff --git a/src/IrrationalConstants.jl b/src/IrrationalConstants.jl
index e9c2b27..c61978f 100644
--- a/src/IrrationalConstants.jl
+++ b/src/IrrationalConstants.jl
@@ -26,7 +26,8 @@ export
     logten,     # log(10)
     logπ,       # log(π)
     log2π,      # log(2π)
-    log4π       # log(4π)
+    log4π,      # log(4π)
+    invℯ, inve # 1 / ℯ
 
 include("stats.jl")
 
diff --git a/src/stats.jl b/src/stats.jl
index c221961..ce1dacc 100644
--- a/src/stats.jl
+++ b/src/stats.jl
@@ -28,3 +28,6 @@
 @irrational logπ    1.1447298858494001741 log(big(π))
 @irrational log2π   1.8378770664093454836 log(2 * big(π))
 @irrational log4π   2.5310242469692907930 log(4 * big(π))
+
+@irrational invℯ    0.367879441171442321595 inv(big(ℯ))
+const inve = invℯ # ASCII alias
diff --git a/test/runtests.jl b/test/runtests.jl
index 0bab199..0ac1257 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -40,3 +40,7 @@ end
   @test isapprox(log(4pi), log4π)
 end
 
+@testset "1/e" begin
+  @test isapprox(invℯ, exp(-1))
+  @test isapprox(inve, exp(-1))
+end