55153989 has 24 divisors (see below), whose sum is σ = 87516000. Its totient is φ = 33193440.

The previous prime is 55153981. The next prime is 55154003. The reversal of 55153989 is 98935155.

55153989 is a `hidden beast` number, since 551 + 5 + 3 + 98 + 9 = 666.

It is not a de Polignac number, because 55153989 - 2³ = 55153981 is a prime.

It is a super-2 number, since 2×55153989² = 6083925005224242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55153981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12882 + ... + 16620.

It is an arithmetic number, because the mean of its divisors is an integer number (3646500).

Almost surely, 2^55153989 is an apocalyptic number.

It is an amenable number.

55153989 is a deficient number, since it is larger than the sum of its proper divisors (32362011).

55153989 is a wasteful number, since it uses less digits than its factorization.

55153989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905 (or 3902 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 55153989 is about 7426.5731666765. The cubic root of 55153989 is about 380.6498322350.

The spelling of 55153989 in words is "fifty-five million, one hundred fifty-three thousand, nine hundred eighty-nine".