55115100 has 144 divisors (see below), whose sum is σ = 179676000. Its totient is φ = 14492160.

The previous prime is 55115083. The next prime is 55115129. The reversal of 55115100 is 151155.

55115100 is a `hidden beast` number, since 551 + 15 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 369826 + ... + 369974.

It is an arithmetic number, because the mean of its divisors is an integer number (1247750).

Almost surely, 2^55115100 is an apocalyptic number.

55115100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55115100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89838000).

55115100 is an abundant number, since it is smaller than the sum of its proper divisors (124560900).

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

55115100 is a wasteful number, since it uses less digits than its factorization.

55115100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 18.

The square root of 55115100 is about 7423.9544718432. The cubic root of 55115100 is about 380.5603459792.

Adding to 55115100 its reverse (151155), we get a palindrome (55266255).

It can be divided in two parts, 551 and 15100, that added together give a palindrome (15651).

The spelling of 55115100 in words is "fifty-five million, one hundred fifteen thousand, one hundred".