57811 has 4 divisors (see below), whose sum is σ = 62272. Its totient is φ = 53352.

The previous prime is 57809. The next prime is 57829. The reversal of 57811 is 11875.

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

It is not a de Polignac number, because 57811 - 2¹ = 57809 is a prime.

It is a super-2 number, since 2×57811² = 6684223442, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (57881) 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, 2211 + ... + 2236.

It is an arithmetic number, because the mean of its divisors is an integer number (15568).

2⁵⁷⁸¹¹ is an apocalyptic number.

57811 is a deficient number, since it is larger than the sum of its proper divisors (4461).

57811 is a wasteful number, since it uses less digits than its factorization.

57811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460.

The product of its digits is 280, while the sum is 22.

The square root of 57811 is about 240.4391814992. The cubic root of 57811 is about 38.6666749240. Note that the first 4 decimals are identical.

It can be divided in two parts, 57 and 811, that added together give a palindrome (868).

The spelling of 57811 in words is "fifty-seven thousand, eight hundred eleven".