51631992 has 160 divisors (see below), whose sum is σ = 158122800. Its totient is φ = 15676416.

The previous prime is 51631961. The next prime is 51632039. The reversal of 51631992 is 29913615.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 473634 + ... + 473742.

Almost surely, 2^51631992 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 51631992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79061400).

51631992 is an abundant number, since it is smaller than the sum of its proper divisors (106490808).

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

51631992 is a wasteful number, since it uses less digits than its factorization.

51631992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 174 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 51631992 is about 7185.5404807154. The cubic root of 51631992 is about 372.3685213806.

The spelling of 51631992 in words is "fifty-one million, six hundred thirty-one thousand, nine hundred ninety-two".