999001011 has 4 divisors (see below), whose sum is σ = 1332001352. Its totient is φ = 666000672.

The previous prime is 999001007. The next prime is 999001043. The reversal of 999001011 is 110100999.

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

It is not a de Polignac number, because 999001011 - 2² = 999001007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999001011.

It is not an unprimeable number, because it can be changed into a prime (999001111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166500166 + ... + 166500171.

It is an arithmetic number, because the mean of its divisors is an integer number (333000338).

Almost surely, 2^999001011 is an apocalyptic number.

999001011 is a deficient number, since it is larger than the sum of its proper divisors (333000341).

999001011 is a wasteful number, since it uses less digits than its factorization.

999001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333000340.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 999001011 is about 31606.9772518664. The cubic root of 999001011 is about 999.6668927185. Note that the first 3 decimals are identical.

The spelling of 999001011 in words is "nine hundred ninety-nine million, one thousand, eleven".