55331500 has 48 divisors (see below), whose sum is σ = 138116160. Its totient is φ = 18969600.

The previous prime is 55331473. The next prime is 55331503. The reversal of 55331500 is 513355.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55331503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4405 + ... + 11404.

It is an arithmetic number, because the mean of its divisors is an integer number (2877420).

Almost surely, 2^55331500 is an apocalyptic number.

55331500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55331500 is an abundant number, since it is smaller than the sum of its proper divisors (82784660).

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

55331500 is a wasteful number, since it uses less digits than its factorization.

55331500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15835 (or 15823 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 22.

The square root of 55331500 is about 7438.5146366731. The cubic root of 55331500 is about 381.0577638760.

Adding to 55331500 its reverse (513355), we get a palindrome (55844855).

The spelling of 55331500 in words is "fifty-five million, three hundred thirty-one thousand, five hundred".