56557769 has 2 divisors, whose sum is σ = 56557770. Its totient is φ = 56557768.

The previous prime is 56557757. The next prime is 56557789. The reversal of 56557769 is 96775565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47334400 + 9223369 = 6880^2 + 3037^2 .

It is a cyclic number.

It is not a de Polignac number, because 56557769 - 2²⁰ = 55509193 is a prime.

It is a super-2 number, since 2×56557769² = 6397562468514722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56557729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278884 + 28278885.

It is an arithmetic number, because the mean of its divisors is an integer number (28278885).

Almost surely, 2^56557769 is an apocalyptic number.

It is an amenable number.

56557769 is a deficient number, since it is larger than the sum of its proper divisors (1).

56557769 is an equidigital number, since it uses as much as digits as its factorization.

56557769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1984500, while the sum is 50.

The square root of 56557769 is about 7520.4899441459. The cubic root of 56557769 is about 383.8522493824.

The spelling of 56557769 in words is "fifty-six million, five hundred fifty-seven thousand, seven hundred sixty-nine".