1139940181 has 2 divisors, whose sum is σ = 1139940182. Its totient is φ = 1139940180.

The previous prime is 1139940167. The next prime is 1139940227. The reversal of 1139940181 is 1810499311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 859076100 + 280864081 = 29310^2 + 16759^2 .

It is a cyclic number.

It is not a de Polignac number, because 1139940181 - 2¹⁷ = 1139809109 is a prime.

It is a super-2 number, since 2×1139940181² = 2598927232516625522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1139940181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1139940101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569970090 + 569970091.

It is an arithmetic number, because the mean of its divisors is an integer number (569970091).

Almost surely, 2^1139940181 is an apocalyptic number.

It is an amenable number.

1139940181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139940181 is an equidigital number, since it uses as much as digits as its factorization.

1139940181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 1139940181 is about 33763.0001777093. Note that the first 3 decimals coincide. The cubic root of 1139940181 is about 1044.6256547030.

The spelling of 1139940181 in words is "one billion, one hundred thirty-nine million, nine hundred forty thousand, one hundred eighty-one".