684958931 has 2 divisors, whose sum is σ = 684958932. Its totient is φ = 684958930.

The previous prime is 684958861. The next prime is 684958933. The reversal of 684958931 is 139859486.

684958931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684958931 - 2¹⁴ = 684942547 is a prime.

It is a super-2 number, since 2×684958931² = 938337474313325522, which contains 22 as substring.

Together with 684958933, 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 (684958933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342479465 + 342479466.

It is an arithmetic number, because the mean of its divisors is an integer number (342479466).

Almost surely, 2^684958931 is an apocalyptic number.

684958931 is a deficient number, since it is larger than the sum of its proper divisors (1).

684958931 is an equidigital number, since it uses as much as digits as its factorization.

684958931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The square root of 684958931 is about 26171.7200619294. The cubic root of 684958931 is about 881.4983645754.

The spelling of 684958931 in words is "six hundred eighty-four million, nine hundred fifty-eight thousand, nine hundred thirty-one".