56505557 has 2 divisors, whose sum is σ = 56505558. Its totient is φ = 56505556.

The previous prime is 56505551. The next prime is 56505607. The reversal of 56505557 is 75550565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53567761 + 2937796 = 7319^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 56505557 - 2¹⁰ = 56504533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56505557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56505551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28252778 + 28252779.

It is an arithmetic number, because the mean of its divisors is an integer number (28252779).

Almost surely, 2^56505557 is an apocalyptic number.

It is an amenable number.

56505557 is a deficient number, since it is larger than the sum of its proper divisors (1).

56505557 is an equidigital number, since it uses as much as digits as its factorization.

56505557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131250, while the sum is 38.

The square root of 56505557 is about 7517.0178262393. The cubic root of 56505557 is about 383.7340937077.

The spelling of 56505557 in words is "fifty-six million, five hundred five thousand, five hundred fifty-seven".