56207521 has 2 divisors, whose sum is σ = 56207522. Its totient is φ = 56207520.

The previous prime is 56207513. The next prime is 56207531. The reversal of 56207521 is 12570265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 5953600 = 7089^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 56207521 - 2³ = 56207513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56207521.

It is not a weakly prime, because it can be changed into another prime (56207531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28103760 + 28103761.

It is an arithmetic number, because the mean of its divisors is an integer number (28103761).

Almost surely, 2^56207521 is an apocalyptic number.

It is an amenable number.

56207521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56207521 is an equidigital number, since it uses as much as digits as its factorization.

56207521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 56207521 is about 7497.1675318083. The cubic root of 56207521 is about 383.0582413640.

Adding to 56207521 its reverse (12570265), we get a palindrome (68777786).

It can be divided in two parts, 5 and 6207521, that added together give a triangular number (6207526 = T₃₅₂₃).

The spelling of 56207521 in words is "fifty-six million, two hundred seven thousand, five hundred twenty-one".