57081 has 8 divisors (see below), whose sum is σ = 77760. Its totient is φ = 37232.

The previous prime is 57077. The next prime is 57089. The reversal of 57081 is 18075.

It is a happy number.

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 57081 - 2² = 57077 is a prime.

It is a super-2 number, since 2×57081² = 6516481122, which contains 22 as substring.

57081 is a modest number, since divided by 81 gives 57 as remainder.

57081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (57089) 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, 21 + ... + 338.

It is an arithmetic number, because the mean of its divisors is an integer number (9720).

2⁵⁷⁰⁸¹ is an apocalyptic number.

It is an amenable number.

57081 is a deficient number, since it is larger than the sum of its proper divisors (20679).

57081 is a wasteful number, since it uses less digits than its factorization.

57081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 57081 is about 238.9163033365. The cubic root of 57081 is about 38.5032324266.

The spelling of 57081 in words is "fifty-seven thousand, eighty-one".