55177989 has 16 divisors (see below), whose sum is σ = 78847872. Its totient is φ = 34233408.

The previous prime is 55177979. The next prime is 55178009. The reversal of 55177989 is 98977155.

55177989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55177989 - 2⁴ = 55177973 is a prime.

It is a super-2 number, since 2×55177989² = 6089220940168242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55177909) 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 in 15 ways as a sum of consecutive naturals, for example, 8254 + ... + 13359.

It is an arithmetic number, because the mean of its divisors is an integer number (4927992).

Almost surely, 2^55177989 is an apocalyptic number.

It is an amenable number.

55177989 is a deficient number, since it is larger than the sum of its proper divisors (23669883).

55177989 is a wasteful number, since it uses less digits than its factorization.

55177989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21676.

The product of its digits is 793800, while the sum is 51.

The square root of 55177989 is about 7428.1888102013. The cubic root of 55177989 is about 380.7050368923.

The spelling of 55177989 in words is "fifty-five million, one hundred seventy-seven thousand, nine hundred eighty-nine".