56889809 has 2 divisors, whose sum is σ = 56889810. Its totient is φ = 56889808.

The previous prime is 56889739. The next prime is 56889841. The reversal of 56889809 is 90898865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51437584 + 5452225 = 7172^2 + 2335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56889809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56889109) 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, 28444904 + 28444905.

It is an arithmetic number, because the mean of its divisors is an integer number (28444905).

Almost surely, 2^56889809 is an apocalyptic number.

It is an amenable number.

56889809 is a deficient number, since it is larger than the sum of its proper divisors (1).

56889809 is an equidigital number, since it uses as much as digits as its factorization.

56889809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The square root of 56889809 is about 7542.5333277354. The cubic root of 56889809 is about 384.6019588883.

The spelling of 56889809 in words is "fifty-six million, eight hundred eighty-nine thousand, eight hundred nine".