51129992 has 16 divisors (see below), whose sum is σ = 97025040. Its totient is φ = 25256656.

The previous prime is 51129983. The next prime is 51130021. The reversal of 51129992 is 29992115.

It is a super-2 number, since 2×51129992² = 5228552163840128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37838 + ... + 39165.

It is an arithmetic number, because the mean of its divisors is an integer number (6064065).

Almost surely, 2^51129992 is an apocalyptic number.

It is an amenable number.

51129992 is a deficient number, since it is larger than the sum of its proper divisors (45895048).

51129992 is a wasteful number, since it uses less digits than its factorization.

51129992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77092 (or 77088 counting only the distinct ones).

The product of its digits is 14580, while the sum is 38.

The square root of 51129992 is about 7150.5238968904. The cubic root of 51129992 is about 371.1577855593.

It can be divided in two parts, 511 and 29992, that added together give a palindrome (30503).

The spelling of 51129992 in words is "fifty-one million, one hundred twenty-nine thousand, nine hundred ninety-two".