51138825 has 48 divisors (see below), whose sum is σ = 87928896. Its totient is φ = 26208000.

The previous prime is 51138733. The next prime is 51138851. The reversal of 51138825 is 52883115.

It is a happy number.

It is not a de Polignac number, because 51138825 - 2⁷ = 51138697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 325647 + ... + 325803.

It is an arithmetic number, because the mean of its divisors is an integer number (1831852).

Almost surely, 2^51138825 is an apocalyptic number.

It is an amenable number.

51138825 is a deficient number, since it is larger than the sum of its proper divisors (36790071).

51138825 is a wasteful number, since it uses less digits than its factorization.

51138825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 309 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 51138825 is about 7151.1415172684. The cubic root of 51138825 is about 371.1791575422.

The spelling of 51138825 in words is "fifty-one million, one hundred thirty-eight thousand, eight hundred twenty-five".