56072509 has 2 divisors, whose sum is σ = 56072510. Its totient is φ = 56072508.

The previous prime is 56072503. The next prime is 56072519. The reversal of 56072509 is 90527065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36905625 + 19166884 = 6075^2 + 4378^2 .

It is a cyclic number.

It is not a de Polignac number, because 56072509 - 2⁷ = 56072381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56072503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28036254 + 28036255.

It is an arithmetic number, because the mean of its divisors is an integer number (28036255).

Almost surely, 2^56072509 is an apocalyptic number.

It is an amenable number.

56072509 is a deficient number, since it is larger than the sum of its proper divisors (1).

56072509 is an equidigital number, since it uses as much as digits as its factorization.

56072509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 56072509 is about 7488.1579176724. The cubic root of 56072509 is about 382.7512900128.

The spelling of 56072509 in words is "fifty-six million, seventy-two thousand, five hundred nine".