55988809 has 2 divisors, whose sum is σ = 55988810. Its totient is φ = 55988808.

The previous prime is 55988791. The next prime is 55988827. The reversal of 55988809 is 90888955.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (55988791) and next prime (55988827).

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 635209 = 7440^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 55988809 - 2⁹ = 55988297 is a prime.

It is not a weakly prime, because it can be changed into another prime (55988899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27994404 + 27994405.

It is an arithmetic number, because the mean of its divisors is an integer number (27994405).

Almost surely, 2^55988809 is an apocalyptic number.

It is an amenable number.

55988809 is a deficient number, since it is larger than the sum of its proper divisors (1).

55988809 is an equidigital number, since it uses as much as digits as its factorization.

55988809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 52.

The square root of 55988809 is about 7482.5670060481. The cubic root of 55988809 is about 382.5607496032.

The spelling of 55988809 in words is "fifty-five million, nine hundred eighty-eight thousand, eight hundred nine".