56136989 has 2 divisors, whose sum is σ = 56136990. Its totient is φ = 56136988.

The previous prime is 56136961. The next prime is 56137007. The reversal of 56136989 is 98963165.

56136989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 708964 = 7445^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 56136989 - 2²⁰ = 55088413 is a prime.

It is a super-2 number, since 2×56136989² = 6302723067972242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56136929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28068494 + 28068495.

It is an arithmetic number, because the mean of its divisors is an integer number (28068495).

Almost surely, 2^56136989 is an apocalyptic number.

It is an amenable number.

56136989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56136989 is an equidigital number, since it uses as much as digits as its factorization.

56136989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 56136989 is about 7492.4621453832. The cubic root of 56136989 is about 382.8979474365.

The spelling of 56136989 in words is "fifty-six million, one hundred thirty-six thousand, nine hundred eighty-nine".