68904931 has 2 divisors, whose sum is σ = 68904932. Its totient is φ = 68904930.

The previous prime is 68904917. The next prime is 68904943. The reversal of 68904931 is 13940986.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68904931 is a prime.

It is a super-2 number, since 2×68904931² = 9495779032229522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68904991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34452465 + 34452466.

It is an arithmetic number, because the mean of its divisors is an integer number (34452466).

Almost surely, 2^68904931 is an apocalyptic number.

68904931 is a deficient number, since it is larger than the sum of its proper divisors (1).

68904931 is an equidigital number, since it uses as much as digits as its factorization.

68904931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 68904931 is about 8300.8994091002. The cubic root of 68904931 is about 409.9681335534.

The spelling of 68904931 in words is "sixty-eight million, nine hundred four thousand, nine hundred thirty-one".