568091921 has 2 divisors, whose sum is σ = 568091922. Its totient is φ = 568091920.

The previous prime is 568091911. The next prime is 568091939. The reversal of 568091921 is 129190865.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560742400 + 7349521 = 23680^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 568091921 - 2⁶ = 568091857 is a prime.

It is not a weakly prime, because it can be changed into another prime (568091911) 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, 284045960 + 284045961.

It is an arithmetic number, because the mean of its divisors is an integer number (284045961).

Almost surely, 2^568091921 is an apocalyptic number.

It is an amenable number.

568091921 is a deficient number, since it is larger than the sum of its proper divisors (1).

568091921 is an equidigital number, since it uses as much as digits as its factorization.

568091921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 568091921 is about 23834.6789573512. The cubic root of 568091921 is about 828.2082221355.

The spelling of 568091921 in words is "five hundred sixty-eight million, ninety-one thousand, nine hundred twenty-one".