51912731 has 8 divisors (see below), whose sum is σ = 58848720. Its totient is φ = 45397152.

The previous prime is 51912719. The next prime is 51912787. The reversal of 51912731 is 13721915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51912731 is a prime.

It is a super-2 number, since 2×51912731² = 5389863279756722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51912694 and 51912703.

It is not an unprimeable number, because it can be changed into a prime (51912701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104840 + ... + 105333.

It is an arithmetic number, because the mean of its divisors is an integer number (7356090).

Almost surely, 2^51912731 is an apocalyptic number.

51912731 is a deficient number, since it is larger than the sum of its proper divisors (6935989).

51912731 is a wasteful number, since it uses less digits than its factorization.

51912731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210205.

The product of its digits is 1890, while the sum is 29.

The square root of 51912731 is about 7205.0489935878. The cubic root of 51912731 is about 373.0421958699.

The spelling of 51912731 in words is "fifty-one million, nine hundred twelve thousand, seven hundred thirty-one".