57085561 has 8 divisors (see below), whose sum is σ = 63138824. Its totient is φ = 51269760.

The previous prime is 57085559. The next prime is 57085577. The reversal of 57085561 is 16558075.

It can be written as a sum of positive squares in 4 ways, for example, as 2621161 + 54464400 = 1619^2 + 7380^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57085561 - 2¹ = 57085559 is a prime.

It is a super-2 number, since 2×57085561² = 6517522549369442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 57085561.

It is not an unprimeable number, because it can be changed into a prime (57085591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58860 + ... + 59821.

It is an arithmetic number, because the mean of its divisors is an integer number (7892353).

Almost surely, 2^57085561 is an apocalyptic number.

It is an amenable number.

57085561 is a deficient number, since it is larger than the sum of its proper divisors (6053263).

57085561 is a wasteful number, since it uses less digits than its factorization.

57085561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118731.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 57085561 is about 7555.4987260935. The cubic root of 57085561 is about 385.0425792004.

The spelling of 57085561 in words is "fifty-seven million, eighty-five thousand, five hundred sixty-one".