51431232 has 56 divisors (see below), whose sum is σ = 140484352. Its totient is φ = 16588800.

The previous prime is 51431213. The next prime is 51431249. The reversal of 51431232 is 23213415.

It is a super-3 number, since 3×51431232³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51431199 and 51431208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632 + ... + 10272.

Almost surely, 2^51431232 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 51431232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70242176).

51431232 is an abundant number, since it is smaller than the sum of its proper divisors (89053120).

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

51431232 is a wasteful number, since it uses less digits than its factorization.

51431232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8687 (or 8677 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 51431232 is about 7171.5571530875. The cubic root of 51431232 is about 371.8852692784.

Adding to 51431232 its reverse (23213415), we get a palindrome (74644647).

The spelling of 51431232 in words is "fifty-one million, four hundred thirty-one thousand, two hundred thirty-two".