56402891 has 2 divisors, whose sum is σ = 56402892. Its totient is φ = 56402890.

The previous prime is 56402869. The next prime is 56402909. The reversal of 56402891 is 19820465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56402891 - 2¹⁰ = 56401867 is a prime.

It is a super-2 number, since 2×56402891² = 6362572226315762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56402851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28201445 + 28201446.

It is an arithmetic number, because the mean of its divisors is an integer number (28201446).

Almost surely, 2^56402891 is an apocalyptic number.

56402891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56402891 is an equidigital number, since it uses as much as digits as its factorization.

56402891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 56402891 is about 7510.1858166093. The cubic root of 56402891 is about 383.5015482691.

The spelling of 56402891 in words is "fifty-six million, four hundred two thousand, eight hundred ninety-one".