55418989 has 2 divisors, whose sum is σ = 55418990. Its totient is φ = 55418988.

The previous prime is 55418981. The next prime is 55419011. The reversal of 55418989 is 98981455.

55418989 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., 51236964 + 4182025 = 7158^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 55418989 - 2³ = 55418981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55418981) 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, 27709494 + 27709495.

It is an arithmetic number, because the mean of its divisors is an integer number (27709495).

Almost surely, 2^55418989 is an apocalyptic number.

It is an amenable number.

55418989 is a deficient number, since it is larger than the sum of its proper divisors (1).

55418989 is an equidigital number, since it uses as much as digits as its factorization.

55418989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 49.

The square root of 55418989 is about 7444.3931250304. The cubic root of 55418989 is about 381.2584982787.

The spelling of 55418989 in words is "fifty-five million, four hundred eighteen thousand, nine hundred eighty-nine".