56256581 has 2 divisors, whose sum is σ = 56256582. Its totient is φ = 56256580.

The previous prime is 56256527. The next prime is 56256631. The reversal of 56256581 is 18565265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 1865956 = 7375^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 56256581 - 2⁶ = 56256517 is a prime.

It is a super-2 number, since 2×56256581² = 6329605811619122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56256521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28128290 + 28128291.

It is an arithmetic number, because the mean of its divisors is an integer number (28128291).

Almost surely, 2^56256581 is an apocalyptic number.

It is an amenable number.

56256581 is a deficient number, since it is larger than the sum of its proper divisors (1).

56256581 is an equidigital number, since it uses as much as digits as its factorization.

56256581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 38.

The square root of 56256581 is about 7500.4387205016. The cubic root of 56256581 is about 383.1696580804.

The spelling of 56256581 in words is "fifty-six million, two hundred fifty-six thousand, five hundred eighty-one".