51499931 has 6 divisors (see below), whose sum is σ = 59908140. Its totient is φ = 44142756.

The previous prime is 51499891. The next prime is 51499933. The reversal of 51499931 is 13999415.

It is not a de Polignac number, because 51499931 - 2¹⁴ = 51483547 is a prime.

It is a super-2 number, since 2×51499931² = 5304485786009522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51499933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 525461 + ... + 525558.

It is an arithmetic number, because the mean of its divisors is an integer number (9984690).

Almost surely, 2^51499931 is an apocalyptic number.

51499931 is a deficient number, since it is larger than the sum of its proper divisors (8408209).

51499931 is a wasteful number, since it uses less digits than its factorization.

51499931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051033 (or 1051026 counting only the distinct ones).

The product of its digits is 43740, while the sum is 41.

The square root of 51499931 is about 7176.3452397443. The cubic root of 51499931 is about 372.0507768781.

The spelling of 51499931 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred thirty-one".