56289209 has 2 divisors, whose sum is σ = 56289210. Its totient is φ = 56289208.

The previous prime is 56289161. The next prime is 56289217. The reversal of 56289209 is 90298265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 861184 = 7445^2 + 928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56289209 is a prime.

It is not a weakly prime, because it can be changed into another prime (56289239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28144604 + 28144605.

It is an arithmetic number, because the mean of its divisors is an integer number (28144605).

Almost surely, 2^56289209 is an apocalyptic number.

It is an amenable number.

56289209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56289209 is an equidigital number, since it uses as much as digits as its factorization.

56289209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 56289209 is about 7502.6134779822. The cubic root of 56289209 is about 383.2437213761.

The spelling of 56289209 in words is "fifty-six million, two hundred eighty-nine thousand, two hundred nine".