139999931 has 2 divisors, whose sum is σ = 139999932. Its totient is φ = 139999930.

The previous prime is 139999921. The next prime is 139999957.

139999931 is nontrivially palindromic in base 10.

139999931 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 139999931 - 2²² = 135805627 is a prime.

It is a super-2 number, since 2×139999931² = 39199961360009522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139999901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69999965 + 69999966.

It is an arithmetic number, because the mean of its divisors is an integer number (69999966).

Almost surely, 2^139999931 is an apocalyptic number.

139999931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139999931 is an equidigital number, since it uses as much as digits as its factorization.

139999931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 531441, while the sum is 53.

The square root of 139999931 is about 11832.1566504167. The cubic root of 139999931 is about 519.2493248798.

The spelling of 139999931 in words is "one hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred thirty-one".