51297138 has 20 divisors (see below), whose sum is σ = 114943950. Its totient is φ = 17098992.

The previous prime is 51297119. The next prime is 51297167. The reversal of 51297138 is 83179215.

51297138 is a `hidden beast` number, since 512 + 9 + 7 + 138 = 666.

It can be written as a sum of positive squares in only one way, i.e., 32867289 + 18429849 = 5733^2 + 4293^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 158163 + ... + 158486.

Almost surely, 2^51297138 is an apocalyptic number.

51297138 is an abundant number, since it is smaller than the sum of its proper divisors (63646812).

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

51297138 is a wasteful number, since it uses less digits than its factorization.

51297138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316663 (or 316654 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 51297138 is about 7162.2020356871. The cubic root of 51297138 is about 371.5617888865.

The spelling of 51297138 in words is "fifty-one million, two hundred ninety-seven thousand, one hundred thirty-eight".