56531009 has 2 divisors, whose sum is σ = 56531010. Its totient is φ = 56531008.

The previous prime is 56530993. The next prime is 56531017. The reversal of 56531009 is 90013565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41731600 + 14799409 = 6460^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 56531009 - 2⁴ = 56530993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56531029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28265504 + 28265505.

It is an arithmetic number, because the mean of its divisors is an integer number (28265505).

Almost surely, 2^56531009 is an apocalyptic number.

It is an amenable number.

56531009 is a deficient number, since it is larger than the sum of its proper divisors (1).

56531009 is an equidigital number, since it uses as much as digits as its factorization.

56531009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 56531009 is about 7518.7105942442. The cubic root of 56531009 is about 383.7917006324.

The spelling of 56531009 in words is "fifty-six million, five hundred thirty-one thousand, nine".