55018989 has 12 divisors (see below), whose sum is σ = 79815996. Its totient is φ = 36520512.

The previous prime is 55018961. The next prime is 55019009. The reversal of 55018989 is 98981055.

55018989 is a `hidden beast` number, since 550 + 1 + 8 + 98 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9253764 + 45765225 = 3042^2 + 6765^2 .

It is not a de Polignac number, because 55018989 - 2¹³ = 55010797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55018289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11022 + ... + 15215.

It is an arithmetic number, because the mean of its divisors is an integer number (6651333).

Almost surely, 2^55018989 is an apocalyptic number.

It is an amenable number.

55018989 is a deficient number, since it is larger than the sum of its proper divisors (24797007).

55018989 is a wasteful number, since it uses less digits than its factorization.

55018989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26476 (or 26473 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 55018989 is about 7417.4786147316. The cubic root of 55018989 is about 380.3390072611.

The spelling of 55018989 in words is "fifty-five million, eighteen thousand, nine hundred eighty-nine".