56818889 has 2 divisors, whose sum is σ = 56818890. Its totient is φ = 56818888.

The previous prime is 56818849. The next prime is 56818903. The reversal of 56818889 is 98881865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56505289 + 313600 = 7517^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 56818889 - 2²⁰ = 55770313 is a prime.

It is a super-2 number, since 2×56818889² = 6456772294388642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56818889.

It is not a weakly prime, because it can be changed into another prime (56818849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28409444 + 28409445.

It is an arithmetic number, because the mean of its divisors is an integer number (28409445).

Almost surely, 2^56818889 is an apocalyptic number.

It is an amenable number.

56818889 is a deficient number, since it is larger than the sum of its proper divisors (1).

56818889 is an equidigital number, since it uses as much as digits as its factorization.

56818889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1105920, while the sum is 53.

The square root of 56818889 is about 7537.8305234331. The cubic root of 56818889 is about 384.4420748744.

The spelling of 56818889 in words is "fifty-six million, eight hundred eighteen thousand, eight hundred eighty-nine".