55131300 has 144 divisors (see below), whose sum is σ = 202625920. Its totient is φ = 12597120.

The previous prime is 55131277. The next prime is 55131301. The reversal of 55131300 is 313155.

It is a happy number.

55131300 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

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

55131300 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (55131301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17442 + ... + 20358.

Almost surely, 2^55131300 is an apocalyptic number.

55131300 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 55131300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101312960).

55131300 is an abundant number, since it is smaller than the sum of its proper divisors (147494620).

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

55131300 is a wasteful number, since it uses less digits than its factorization.

55131300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947 (or 2934 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 55131300 is about 7425.0454544063. The cubic root of 55131300 is about 380.5976284037.

Adding to 55131300 its reverse (313155), we get a palindrome (55444455).

The spelling of 55131300 in words is "fifty-five million, one hundred thirty-one thousand, three hundred".