57156561 has 48 divisors (see below), whose sum is σ = 104552448. Its totient is φ = 29224800.

The previous prime is 57156553. The next prime is 57156563. The reversal of 57156561 is 16565175.

It is not a de Polignac number, because 57156561 - 2³ = 57156553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57156563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45816 + ... + 47046.

It is an arithmetic number, because the mean of its divisors is an integer number (2178176).

Almost surely, 2^57156561 is an apocalyptic number.

It is an amenable number.

57156561 is a deficient number, since it is larger than the sum of its proper divisors (47395887).

57156561 is a wasteful number, since it uses less digits than its factorization.

57156561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1319 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 57156561 is about 7560.1958307970. The cubic root of 57156561 is about 385.2021449271.

The spelling of 57156561 in words is "fifty-seven million, one hundred fifty-six thousand, five hundred sixty-one".