56807521 has 2 divisors, whose sum is σ = 56807522. Its totient is φ = 56807520.

The previous prime is 56807483. The next prime is 56807533. The reversal of 56807521 is 12570865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 6553600 = 7089^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 56807521 - 2¹¹ = 56805473 is a prime.

It is not a weakly prime, because it can be changed into another prime (56807561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28403760 + 28403761.

It is an arithmetic number, because the mean of its divisors is an integer number (28403761).

Almost surely, 2^56807521 is an apocalyptic number.

It is an amenable number.

56807521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56807521 is an equidigital number, since it uses as much as digits as its factorization.

56807521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 56807521 is about 7537.0764225925. The cubic root of 56807521 is about 384.4164341700.

The spelling of 56807521 in words is "fifty-six million, eight hundred seven thousand, five hundred twenty-one".