56551009 has 2 divisors, whose sum is σ = 56551010. Its totient is φ = 56551008.

The previous prime is 56550961. The next prime is 56551021. The reversal of 56551009 is 90015565.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52128400 + 4422609 = 7220^2 + 2103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56551009 is a prime.

It is not a weakly prime, because it can be changed into another prime (56551109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28275504 + 28275505.

It is an arithmetic number, because the mean of its divisors is an integer number (28275505).

Almost surely, 2^56551009 is an apocalyptic number.

It is an amenable number.

56551009 is a deficient number, since it is larger than the sum of its proper divisors (1).

56551009 is an equidigital number, since it uses as much as digits as its factorization.

56551009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 56551009 is about 7520.0404919123. The cubic root of 56551009 is about 383.8369556120.

The spelling of 56551009 in words is "fifty-six million, five hundred fifty-one thousand, nine".