56391857 has 2 divisors, whose sum is σ = 56391858. Its totient is φ = 56391856.

The previous prime is 56391827. The next prime is 56391887. The reversal of 56391857 is 75819365.

It is a balanced prime because it is at equal distance from previous prime (56391827) and next prime (56391887).

It can be written as a sum of positive squares in only one way, i.e., 43546801 + 12845056 = 6599^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 56391857 - 2⁶ = 56391793 is a prime.

It is not a weakly prime, because it can be changed into another prime (56391827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28195928 + 28195929.

It is an arithmetic number, because the mean of its divisors is an integer number (28195929).

Almost surely, 2^56391857 is an apocalyptic number.

It is an amenable number.

56391857 is a deficient number, since it is larger than the sum of its proper divisors (1).

56391857 is an equidigital number, since it uses as much as digits as its factorization.

56391857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 56391857 is about 7509.4511783485. The cubic root of 56391857 is about 383.4765387233.

The spelling of 56391857 in words is "fifty-six million, three hundred ninety-one thousand, eight hundred fifty-seven".