56510999 has 2 divisors, whose sum is σ = 56511000. Its totient is φ = 56510998.

The previous prime is 56510989. The next prime is 56511001. The reversal of 56510999 is 99901565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56510999 - 2⁸ = 56510743 is a prime.

Together with 56511001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56510929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28255499 + 28255500.

It is an arithmetic number, because the mean of its divisors is an integer number (28255500).

Almost surely, 2^56510999 is an apocalyptic number.

56510999 is a deficient number, since it is larger than the sum of its proper divisors (1).

56510999 is an equidigital number, since it uses as much as digits as its factorization.

56510999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 56510999 is about 7517.3797961790. The cubic root of 56510999 is about 383.7464123422.

The spelling of 56510999 in words is "fifty-six million, five hundred ten thousand, nine hundred ninety-nine".