55117100 has 36 divisors (see below), whose sum is σ = 125903400. Its totient is φ = 20885760.

The previous prime is 55117031. The next prime is 55117123. The reversal of 55117100 is 171155.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12605 + ... + 16404.

Almost surely, 2^55117100 is an apocalyptic number.

55117100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55117100 is an abundant number, since it is smaller than the sum of its proper divisors (70786300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55117100 is a wasteful number, since it uses less digits than its factorization.

55117100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29042 (or 29035 counting only the distinct ones).

The product of its (nonzero) digits is 175, while the sum is 20.

The square root of 55117100 is about 7424.0891697231. The cubic root of 55117100 is about 380.5649491429.

Adding to 55117100 its reverse (171155), we get a palindrome (55288255).

The spelling of 55117100 in words is "fifty-five million, one hundred seventeen thousand, one hundred".