51731172 has 36 divisors (see below), whose sum is σ = 132914236. Its totient is φ = 16960320.

The previous prime is 51731171. The next prime is 51731203. The reversal of 51731172 is 27113715.

It is a happy number.

51731172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 665856 + 51065316 = 816^2 + 7146^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×51731172² = 5352228312987168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51731171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9583 + ... + 13974.

Almost surely, 2^51731172 is an apocalyptic number.

It is an amenable number.

51731172 is an abundant number, since it is smaller than the sum of its proper divisors (81183064).

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

51731172 is a wasteful number, since it uses less digits than its factorization.

51731172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23628 (or 23623 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 51731172 is about 7192.4385294558. The cubic root of 51731172 is about 372.6067966983.

Adding to 51731172 its reverse (27113715), we get a palindrome (78844887).

The spelling of 51731172 in words is "fifty-one million, seven hundred thirty-one thousand, one hundred seventy-two".