139222931 has 2 divisors, whose sum is σ = 139222932. Its totient is φ = 139222930.

The previous prime is 139222927. The next prime is 139222957.

139222931 is nontrivially palindromic in base 10.

139222931 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 139222931 - 2² = 139222927 is a prime.

It is a super-2 number, since 2×139222931² = 38766049032461522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (139222901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69611465 + 69611466.

It is an arithmetic number, because the mean of its divisors is an integer number (69611466).

Almost surely, 2^139222931 is an apocalyptic number.

139222931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139222931 is an equidigital number, since it uses as much as digits as its factorization.

139222931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 139222931 is about 11799.2767151211. The cubic root of 139222931 is about 518.2869305229.

The spelling of 139222931 in words is "one hundred thirty-nine million, two hundred twenty-two thousand, nine hundred thirty-one".