51531128 has 16 divisors (see below), whose sum is σ = 105404760. Its totient is φ = 23423200.

The previous prime is 51531127. The next prime is 51531133. The reversal of 51531128 is 82113515.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51531097 and 51531106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292703 + ... + 292878.

Almost surely, 2^51531128 is an apocalyptic number.

It is an amenable number.

51531128 is an abundant number, since it is smaller than the sum of its proper divisors (53873632).

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

51531128 is a wasteful number, since it uses less digits than its factorization.

51531128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585598 (or 585594 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 51531128 is about 7178.5185101106. The cubic root of 51531128 is about 372.1258871741.

The spelling of 51531128 in words is "fifty-one million, five hundred thirty-one thousand, one hundred twenty-eight".