53131500 has 72 divisors (see below), whose sum is σ = 167626368. Its totient is φ = 14167200.

The previous prime is 53131483. The next prime is 53131553. The reversal of 53131500 is 513135.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1404 + ... + 10403.

It is an arithmetic number, because the mean of its divisors is an integer number (2328144).

Almost surely, 2^53131500 is an apocalyptic number.

53131500 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 53131500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83813184).

53131500 is an abundant number, since it is smaller than the sum of its proper divisors (114494868).

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

53131500 is a wasteful number, since it uses less digits than its factorization.

53131500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11832 (or 11817 counting only the distinct ones).

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

The square root of 53131500 is about 7289.1357512396. The cubic root of 53131500 is about 375.9389802140.

Adding to 53131500 its reverse (513135), we get a palindrome (53644635).

The spelling of 53131500 in words is "fifty-three million, one hundred thirty-one thousand, five hundred".