56563813 has 2 divisors, whose sum is σ = 56563814. Its totient is φ = 56563812.

The previous prime is 56563807. The next prime is 56563823. The reversal of 56563813 is 31836565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45792289 + 10771524 = 6767^2 + 3282^2 .

It is a cyclic number.

It is not a de Polignac number, because 56563813 - 2⁵ = 56563781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56563823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28281906 + 28281907.

It is an arithmetic number, because the mean of its divisors is an integer number (28281907).

Almost surely, 2^56563813 is an apocalyptic number.

It is an amenable number.

56563813 is a deficient number, since it is larger than the sum of its proper divisors (1).

56563813 is an equidigital number, since it uses as much as digits as its factorization.

56563813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The square root of 56563813 is about 7520.8917689327. The cubic root of 56563813 is about 383.8659222482.

The spelling of 56563813 in words is "fifty-six million, five hundred sixty-three thousand, eight hundred thirteen".