55388569 has 2 divisors, whose sum is σ = 55388570. Its totient is φ = 55388568.

The previous prime is 55388563. The next prime is 55388587. The reversal of 55388569 is 96588355.

It is a happy number.

55388569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 34969 = 7440^2 + 187^2 .

It is a cyclic number.

It is not a de Polignac number, because 55388569 - 2¹⁹ = 54864281 is a prime.

It is a super-2 number, since 2×55388569² = 6135787151735522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55388563) 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, 27694284 + 27694285.

It is an arithmetic number, because the mean of its divisors is an integer number (27694285).

Almost surely, 2^55388569 is an apocalyptic number.

It is an amenable number.

55388569 is a deficient number, since it is larger than the sum of its proper divisors (1).

55388569 is an equidigital number, since it uses as much as digits as its factorization.

55388569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 49.

The square root of 55388569 is about 7442.3496961645. The cubic root of 55388569 is about 381.1887267291.

The spelling of 55388569 in words is "fifty-five million, three hundred eighty-eight thousand, five hundred sixty-nine".