56369809 has 2 divisors, whose sum is σ = 56369810. Its totient is φ = 56369808.

The previous prime is 56369783. The next prime is 56369813. The reversal of 56369809 is 90896365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37638225 + 18731584 = 6135^2 + 4328^2 .

It is a cyclic number.

It is not a de Polignac number, because 56369809 - 2¹⁵ = 56337041 is a prime.

It is not a weakly prime, because it can be changed into another prime (56363809) 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, 28184904 + 28184905.

It is an arithmetic number, because the mean of its divisors is an integer number (28184905).

Almost surely, 2^56369809 is an apocalyptic number.

It is an amenable number.

56369809 is a deficient number, since it is larger than the sum of its proper divisors (1).

56369809 is an equidigital number, since it uses as much as digits as its factorization.

56369809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 56369809 is about 7507.9830180948. The cubic root of 56369809 is about 383.4265551896.

The spelling of 56369809 in words is "fifty-six million, three hundred sixty-nine thousand, eight hundred nine".