57516881 has 4 divisors (see below), whose sum is σ = 57544500. Its totient is φ = 57489264.

The previous prime is 57516871. The next prime is 57516941. The reversal of 57516881 is 18861575.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10182481 + 47334400 = 3191^2 + 6880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57516881 is a prime.

It is a super-2 number, since 2×57516881² = 6616383199936322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (57516841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10406 + ... + 14943.

It is an arithmetic number, because the mean of its divisors is an integer number (14386125).

Almost surely, 2^57516881 is an apocalyptic number.

It is an amenable number.

57516881 is a deficient number, since it is larger than the sum of its proper divisors (27619).

57516881 is a wasteful number, since it uses less digits than its factorization.

57516881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27618.

The product of its digits is 67200, while the sum is 41.

The square root of 57516881 is about 7583.9884625440. The cubic root of 57516881 is about 386.0098993407.

The spelling of 57516881 in words is "fifty-seven million, five hundred sixteen thousand, eight hundred eighty-one".