57911561 has 2 divisors, whose sum is σ = 57911562. Its totient is φ = 57911560.

The previous prime is 57911551. The next prime is 57911599. The reversal of 57911561 is 16511975.

It is a happy number.

57911561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31584400 + 26327161 = 5620^2 + 5131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57911561 is a prime.

It is not a weakly prime, because it can be changed into another prime (57911501) 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, 28955780 + 28955781.

It is an arithmetic number, because the mean of its divisors is an integer number (28955781).

Almost surely, 2^57911561 is an apocalyptic number.

It is an amenable number.

57911561 is a deficient number, since it is larger than the sum of its proper divisors (1).

57911561 is an equidigital number, since it uses as much as digits as its factorization.

57911561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 35.

The square root of 57911561 is about 7609.9645859886. The cubic root of 57911561 is about 386.8908188868.

The spelling of 57911561 in words is "fifty-seven million, nine hundred eleven thousand, five hundred sixty-one".