139131931 has 2 divisors, whose sum is σ = 139131932. Its totient is φ = 139131930.

The previous prime is 139131919. The next prime is 139131947.

It is a happy number.

139131931 is nontrivially palindromic in base 10.

139131931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 139131931 - 2¹⁷ = 139000859 is a prime.

It is a super-2 number, since 2×139131931² = 38715388447577522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139131893 and 139131902.

It is not a weakly prime, because it can be changed into another prime (139131331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69565965 + 69565966.

It is an arithmetic number, because the mean of its divisors is an integer number (69565966).

Almost surely, 2^139131931 is an apocalyptic number.

139131931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139131931 is an equidigital number, since it uses as much as digits as its factorization.

139131931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2187, while the sum is 31.

The square root of 139131931 is about 11795.4199162217. The cubic root of 139131931 is about 518.1739836351.

The spelling of 139131931 in words is "one hundred thirty-nine million, one hundred thirty-one thousand, nine hundred thirty-one".