57561971 has 2 divisors, whose sum is σ = 57561972. Its totient is φ = 57561970.

The previous prime is 57561961. The next prime is 57561989. The reversal of 57561971 is 17916575.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57561971 is a prime.

It is not a weakly prime, because it can be changed into another prime (57561941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28780985 + 28780986.

It is an arithmetic number, because the mean of its divisors is an integer number (28780986).

Almost surely, 2^57561971 is an apocalyptic number.

57561971 is a deficient number, since it is larger than the sum of its proper divisors (1).

57561971 is an equidigital number, since it uses as much as digits as its factorization.

57561971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66150, while the sum is 41.

The square root of 57561971 is about 7586.9605903814. The cubic root of 57561971 is about 386.1107430108.

The spelling of 57561971 in words is "fifty-seven million, five hundred sixty-one thousand, nine hundred seventy-one".