999329121 has 24 divisors (see below), whose sum is σ = 1689926784. Its totient is φ = 557115840.

The previous prime is 999329083. The next prime is 999329129. The reversal of 999329121 is 121923999.

It is not a de Polignac number, because 999329121 - 2¹⁰ = 999328097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999329129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190861 + ... + 196026.

It is an arithmetic number, because the mean of its divisors is an integer number (70413616).

Almost surely, 2^999329121 is an apocalyptic number.

It is an amenable number.

999329121 is a deficient number, since it is larger than the sum of its proper divisors (690597663).

999329121 is a wasteful number, since it uses less digits than its factorization.

999329121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386941 (or 386938 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 999329121 is about 31612.1672936229. The cubic root of 999329121 is about 999.7763236393.

The spelling of 999329121 in words is "nine hundred ninety-nine million, three hundred twenty-nine thousand, one hundred twenty-one".