999323131 has 4 divisors (see below), whose sum is σ = 1000637064. Its totient is φ = 998009200.

The previous prime is 999323123. The next prime is 999323137. The reversal of 999323131 is 131323999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999323131 - 2³ = 999323123 is a prime.

It is a super-2 number, since 2×999323131² = 1997293440303286322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999323137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655825 + ... + 657346.

It is an arithmetic number, because the mean of its divisors is an integer number (250159266).

Almost surely, 2^999323131 is an apocalyptic number.

999323131 is a deficient number, since it is larger than the sum of its proper divisors (1313933).

999323131 is a wasteful number, since it uses less digits than its factorization.

999323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313932.

The product of its digits is 39366, while the sum is 40.

The square root of 999323131 is about 31612.0725514794. The cubic root of 999323131 is about 999.7743260751.

It can be divided in two parts, 9993 and 23131, that added together give a square (33124 = 182²).

The spelling of 999323131 in words is "nine hundred ninety-nine million, three hundred twenty-three thousand, one hundred thirty-one".