56571551 has 2 divisors, whose sum is σ = 56571552. Its totient is φ = 56571550.

The previous prime is 56571527. The next prime is 56571553. The reversal of 56571551 is 15517565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56571551 - 2¹⁴ = 56555167 is a prime.

Together with 56571553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56571553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28285775 + 28285776.

It is an arithmetic number, because the mean of its divisors is an integer number (28285776).

Almost surely, 2^56571551 is an apocalyptic number.

56571551 is a deficient number, since it is larger than the sum of its proper divisors (1).

56571551 is an equidigital number, since it uses as much as digits as its factorization.

56571551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26250, while the sum is 35.

The square root of 56571551 is about 7521.4061850162. The cubic root of 56571551 is about 383.8834258953.

The spelling of 56571551 in words is "fifty-six million, five hundred seventy-one thousand, five hundred fifty-one".