56861 has 4 divisors (see below), whose sum is σ = 64992. Its totient is φ = 48732.

The previous prime is 56857. The next prime is 56873. The reversal of 56861 is 16865.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16865 = 5 ⋅3373.

It is a cyclic number.

It is not a de Polignac number, because 56861 - 2² = 56857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 56861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56821) 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, 4055 + ... + 4068.

It is an arithmetic number, because the mean of its divisors is an integer number (16248).

2⁵⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

56861 is a deficient number, since it is larger than the sum of its proper divisors (8131).

56861 is an equidigital number, since it uses as much as digits as its factorization.

56861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8130.

The product of its digits is 1440, while the sum is 26.

The square root of 56861 is about 238.4554465723. The cubic root of 56861 is about 38.4537027114.

The spelling of 56861 in words is "fifty-six thousand, eight hundred sixty-one".