51917331 has 8 divisors (see below), whose sum is σ = 69317584. Its totient is φ = 34564320.

The previous prime is 51917311. The next prime is 51917347. The reversal of 51917331 is 13371915.

It is a happy number.

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

It is not a de Polignac number, because 51917331 - 2¹⁵ = 51884563 is a prime.

It is a super-2 number, since 2×51917331² = 5390818516327122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51917311) 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, 9160 + ... + 13701.

It is an arithmetic number, because the mean of its divisors is an integer number (8664698).

Almost surely, 2^51917331 is an apocalyptic number.

51917331 is a deficient number, since it is larger than the sum of its proper divisors (17400253).

51917331 is a wasteful number, since it uses less digits than its factorization.

51917331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23621.

The product of its digits is 2835, while the sum is 30.

The square root of 51917331 is about 7205.3682071078. The cubic root of 51917331 is about 373.0532139984.

The spelling of 51917331 in words is "fifty-one million, nine hundred seventeen thousand, three hundred thirty-one".