56400731 has 2 divisors, whose sum is σ = 56400732. Its totient is φ = 56400730.

The previous prime is 56400709. The next prime is 56400733. The reversal of 56400731 is 13700465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56400731 - 2¹⁴ = 56384347 is a prime.

It is a super-2 number, since 2×56400731² = 6362084914668722, which contains 22 as substring.

Together with 56400733, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56400731.

It is not a weakly prime, because it can be changed into another prime (56400733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28200365 + 28200366.

It is an arithmetic number, because the mean of its divisors is an integer number (28200366).

Almost surely, 2^56400731 is an apocalyptic number.

56400731 is a deficient number, since it is larger than the sum of its proper divisors (1).

56400731 is an equidigital number, since it uses as much as digits as its factorization.

56400731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 56400731 is about 7510.0420105350. The cubic root of 56400731 is about 383.4966526931.

The spelling of 56400731 in words is "fifty-six million, four hundred thousand, seven hundred thirty-one".