56205521 has 2 divisors, whose sum is σ = 56205522. Its totient is φ = 56205520.

The previous prime is 56205503. The next prime is 56205533. The reversal of 56205521 is 12550265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32547025 + 23658496 = 5705^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 56205521 - 2²² = 52011217 is a prime.

It is not a weakly prime, because it can be changed into another prime (56205551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28102760 + 28102761.

It is an arithmetic number, because the mean of its divisors is an integer number (28102761).

Almost surely, 2^56205521 is an apocalyptic number.

It is an amenable number.

56205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56205521 is an equidigital number, since it uses as much as digits as its factorization.

56205521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 56205521 is about 7497.0341469144. The cubic root of 56205521 is about 383.0536979295.

Adding to 56205521 its reverse (12550265), we get a palindrome (68755786).

The spelling of 56205521 in words is "fifty-six million, two hundred five thousand, five hundred twenty-one".