686362931 has 2 divisors, whose sum is σ = 686362932. Its totient is φ = 686362930.

The previous prime is 686362921. The next prime is 686362969. The reversal of 686362931 is 139263686.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686362931 is a prime.

It is a super-2 number, since 2×686362931² = 942188146101821522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686362921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343181465 + 343181466.

It is an arithmetic number, because the mean of its divisors is an integer number (343181466).

Almost surely, 2^686362931 is an apocalyptic number.

686362931 is a deficient number, since it is larger than the sum of its proper divisors (1).

686362931 is an equidigital number, since it uses as much as digits as its factorization.

686362931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 686362931 is about 26198.5291762725. The cubic root of 686362931 is about 882.1002396173.

The spelling of 686362931 in words is "six hundred eighty-six million, three hundred sixty-two thousand, nine hundred thirty-one".