56520209 has 2 divisors, whose sum is σ = 56520210. Its totient is φ = 56520208.

The previous prime is 56520199. The next prime is 56520229. The reversal of 56520209 is 90202565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 10660225 = 6772^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 56520209 - 2¹² = 56516113 is a prime.

It is not a weakly prime, because it can be changed into another prime (56520229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28260104 + 28260105.

It is an arithmetic number, because the mean of its divisors is an integer number (28260105).

Almost surely, 2^56520209 is an apocalyptic number.

It is an amenable number.

56520209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56520209 is an equidigital number, since it uses as much as digits as its factorization.

56520209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 56520209 is about 7517.9923516854. The cubic root of 56520209 is about 383.7672585051.

The spelling of 56520209 in words is "fifty-six million, five hundred twenty thousand, two hundred nine".