51533900 has 54 divisors (see below), whose sum is σ = 122947860. Its totient is φ = 18735200.

The previous prime is 51533893. The next prime is 51533903. The reversal of 51533900 is 933515.

It is a self number, because there is not a number n which added to its sum of digits gives 51533900.

It is not an unprimeable number, because it can be changed into a prime (51533903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9971 + ... + 14229.

Almost surely, 2^51533900 is an apocalyptic number.

51533900 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 51533900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61473930).

51533900 is an abundant number, since it is smaller than the sum of its proper divisors (71413960).

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

51533900 is a wasteful number, since it uses less digits than its factorization.

51533900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295 (or 4277 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 26.

The square root of 51533900 is about 7178.7115835643. The cubic root of 51533900 is about 372.1325596101.

The spelling of 51533900 in words is "fifty-one million, five hundred thirty-three thousand, nine hundred".