68190931 has 2 divisors, whose sum is σ = 68190932. Its totient is φ = 68190930.

The previous prime is 68190923. The next prime is 68190949. The reversal of 68190931 is 13909186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68190931 - 2³ = 68190923 is a prime.

It is a super-2 number, since 2×68190931² = 9300006141293522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68190901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34095465 + 34095466.

It is an arithmetic number, because the mean of its divisors is an integer number (34095466).

Almost surely, 2^68190931 is an apocalyptic number.

68190931 is a deficient number, since it is larger than the sum of its proper divisors (1).

68190931 is an equidigital number, since it uses as much as digits as its factorization.

68190931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 68190931 is about 8257.7800285549. The cubic root of 68190931 is about 408.5471701119.

The spelling of 68190931 in words is "sixty-eight million, one hundred ninety thousand, nine hundred thirty-one".