51931572 has 192 divisors, whose sum is σ = 163430400. Its totient is φ = 12700800.

The previous prime is 51931553. The next prime is 51931577. The reversal of 51931572 is 27513915.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51931577) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1403538 + ... + 1403574.

It is an arithmetic number, because the mean of its divisors is an integer number (851200).

Almost surely, 2^51931572 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 51931572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81715200).

51931572 is an abundant number, since it is smaller than the sum of its proper divisors (111498828).

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

51931572 is a wasteful number, since it uses less digits than its factorization.

51931572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 91 counting only the distinct ones).

The product of its digits is 9450, while the sum is 33.

The square root of 51931572 is about 7206.3563608803. The cubic root of 51931572 is about 373.0873205612.

The spelling of 51931572 in words is "fifty-one million, nine hundred thirty-one thousand, five hundred seventy-two".