51931512 has 48 divisors (see below), whose sum is σ = 141687000. Its totient is φ = 17182656.

The previous prime is 51931511. The next prime is 51931553. The reversal of 51931512 is 21513915.

It is a super-2 number, since 2×51931512² = 5393763877212288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51931511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7414 + ... + 12602.

Almost surely, 2^51931512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51931512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70843500).

51931512 is an abundant number, since it is smaller than the sum of its proper divisors (89755488).

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

51931512 is a wasteful number, since it uses less digits than its factorization.

51931512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340 (or 5333 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 51931512 is about 7206.3521978876. The cubic root of 51931512 is about 373.0871768770.

The spelling of 51931512 in words is "fifty-one million, nine hundred thirty-one thousand, five hundred twelve".