55988909 has 2 divisors, whose sum is σ = 55988910. Its totient is φ = 55988908.

The previous prime is 55988899. The next prime is 55988917. The reversal of 55988909 is 90988955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36602500 + 19386409 = 6050^2 + 4403^2 .

It is a cyclic number.

It is not a de Polignac number, because 55988909 - 2⁴ = 55988893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55988809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27994454 + 27994455.

It is an arithmetic number, because the mean of its divisors is an integer number (27994455).

Almost surely, 2^55988909 is an apocalyptic number.

It is an amenable number.

55988909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55988909 is an equidigital number, since it uses as much as digits as its factorization.

55988909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 53.

The square root of 55988909 is about 7482.5736882439. The cubic root of 55988909 is about 382.5609773633.

The spelling of 55988909 in words is "fifty-five million, nine hundred eighty-eight thousand, nine hundred nine".