55819889 has 2 divisors, whose sum is σ = 55819890. Its totient is φ = 55819888.

The previous prime is 55819859. The next prime is 55819913. The reversal of 55819889 is 98891855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 7656289 = 6940^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 55819889 - 2¹⁶ = 55754353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55819889.

It is not a weakly prime, because it can be changed into another prime (55819849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27909944 + 27909945.

It is an arithmetic number, because the mean of its divisors is an integer number (27909945).

Almost surely, 2^55819889 is an apocalyptic number.

It is an amenable number.

55819889 is a deficient number, since it is larger than the sum of its proper divisors (1).

55819889 is an equidigital number, since it uses as much as digits as its factorization.

55819889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 53.

The square root of 55819889 is about 7471.2709092898. The cubic root of 55819889 is about 382.1756294268.

The spelling of 55819889 in words is "fifty-five million, eight hundred nineteen thousand, eight hundred eighty-nine".