56857649 has 2 divisors, whose sum is σ = 56857650. Its totient is φ = 56857648.

The previous prime is 56857637. The next prime is 56857657. The reversal of 56857649 is 94675865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35188624 + 21669025 = 5932^2 + 4655^2 .

It is a cyclic number.

It is not a de Polignac number, because 56857649 - 2²⁰ = 55809073 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56857597 and 56857606.

It is not a weakly prime, because it can be changed into another prime (56857609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28428824 + 28428825.

It is an arithmetic number, because the mean of its divisors is an integer number (28428825).

Almost surely, 2^56857649 is an apocalyptic number.

It is an amenable number.

56857649 is a deficient number, since it is larger than the sum of its proper divisors (1).

56857649 is an equidigital number, since it uses as much as digits as its factorization.

56857649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 50.

The square root of 56857649 is about 7540.4011166516. The cubic root of 56857649 is about 384.5294729682.

The spelling of 56857649 in words is "fifty-six million, eight hundred fifty-seven thousand, six hundred forty-nine".