999931172 has 12 divisors (see below), whose sum is σ = 1757142156. Its totient is φ = 497890560.

The previous prime is 999931171. The next prime is 999931199. The reversal of 999931172 is 271139999.

It can be written as a sum of positive squares in 2 ways, for example, as 797836516 + 202094656 = 28246^2 + 14216^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 999931172.

It is not an unprimeable number, because it can be changed into a prime (999931171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517673 + ... + 519600.

It is an arithmetic number, because the mean of its divisors is an integer number (146428513).

Almost surely, 2^999931172 is an apocalyptic number.

It is an amenable number.

999931172 is a deficient number, since it is larger than the sum of its proper divisors (757210984).

999931172 is a wasteful number, since it uses less digits than its factorization.

999931172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037518 (or 1037516 counting only the distinct ones).

The product of its digits is 275562, while the sum is 50.

The square root of 999931172 is about 31621.6883167234. The cubic root of 999931172 is about 999.9770568069.

The spelling of 999931172 in words is "nine hundred ninety-nine million, nine hundred thirty-one thousand, one hundred seventy-two".