56431009 has 2 divisors, whose sum is σ = 56431010. Its totient is φ = 56431008.

The previous prime is 56430991. The next prime is 56431057. The reversal of 56431009 is 90013465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37246609 + 19184400 = 6103^2 + 4380^2 .

It is a cyclic number.

It is not a de Polignac number, because 56431009 - 2⁵ = 56430977 is a prime.

It is not a weakly prime, because it can be changed into another prime (56431079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28215504 + 28215505.

It is an arithmetic number, because the mean of its divisors is an integer number (28215505).

Almost surely, 2^56431009 is an apocalyptic number.

It is an amenable number.

56431009 is a deficient number, since it is larger than the sum of its proper divisors (1).

56431009 is an equidigital number, since it uses as much as digits as its factorization.

56431009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 56431009 is about 7512.0575743268. The cubic root of 56431009 is about 383.5652654825.

The spelling of 56431009 in words is "fifty-six million, four hundred thirty-one thousand, nine".