56891 has 2 divisors, whose sum is σ = 56892. Its totient is φ = 56890.

The previous prime is 56873. The next prime is 56893. The reversal of 56891 is 19865.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56891 - 2⁶ = 56827 is a prime.

It is a Sophie Germain prime.

Together with 56893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28445 + 28446.

It is an arithmetic number, because the mean of its divisors is an integer number (28446).

2⁵⁶⁸⁹¹ is an apocalyptic number.

56891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56891 is an equidigital number, since it uses as much as digits as its factorization.

56891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 56891 is about 238.5183431101. The cubic root of 56891 is about 38.4604642777.

The spelling of 56891 in words is "fifty-six thousand, eight hundred ninety-one".