51831900 has 162 divisors, whose sum is σ = 170839760. Its totient is φ = 13646880.

The previous prime is 51831893. The next prime is 51831911. The reversal of 51831900 is 913815.

51831900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (162).

It is a super-2 number, since 2×51831900² = 5373091715220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 656061 + ... + 656139.

Almost surely, 2^51831900 is an apocalyptic number.

51831900 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 51831900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85419880).

51831900 is an abundant number, since it is smaller than the sum of its proper divisors (119007860).

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

51831900 is an equidigital number, since it uses as much as digits as its factorization.

51831900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 51831900 is about 7199.4374780256. The cubic root of 51831900 is about 372.8484794997.

The spelling of 51831900 in words is "fifty-one million, eight hundred thirty-one thousand, nine hundred".