139717931 has 2 divisors, whose sum is σ = 139717932. Its totient is φ = 139717930.

The previous prime is 139717909. The next prime is 139717933.

139717931 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 139717931 - 2⁶ = 139717867 is a prime.

It is a super-2 number, since 2×139717931² = 39042200485841522, which contains 22 as substring.

Together with 139717933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139717933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69858965 + 69858966.

It is an arithmetic number, because the mean of its divisors is an integer number (69858966).

Almost surely, 2^139717931 is an apocalyptic number.

139717931 is a deficient number, since it is larger than the sum of its proper divisors (1).

139717931 is an equidigital number, since it uses as much as digits as its factorization.

139717931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35721, while the sum is 41.

The square root of 139717931 is about 11820.2339655355. The cubic root of 139717931 is about 518.9004515270.

The spelling of 139717931 in words is "one hundred thirty-nine million, seven hundred seventeen thousand, nine hundred thirty-one".