56521837 has 2 divisors, whose sum is σ = 56521838. Its totient is φ = 56521836.

The previous prime is 56521831. The next prime is 56521847. The reversal of 56521837 is 73812565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 4955076 = 7181^2 + 2226^2 .

It is a cyclic number.

It is not a de Polignac number, because 56521837 - 2²³ = 48133229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56521796 and 56521805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56521831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28260918 + 28260919.

It is an arithmetic number, because the mean of its divisors is an integer number (28260919).

Almost surely, 2^56521837 is an apocalyptic number.

It is an amenable number.

56521837 is a deficient number, since it is larger than the sum of its proper divisors (1).

56521837 is an equidigital number, since it uses as much as digits as its factorization.

56521837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 56521837 is about 7518.1006244929. The cubic root of 56521837 is about 383.7709431287.

The spelling of 56521837 in words is "fifty-six million, five hundred twenty-one thousand, eight hundred thirty-seven".