999505999 has 16 divisors (see below), whose sum is σ = 1056478464. Its totient is φ = 944352000.

The previous prime is 999505993. The next prime is 999506021.

It is a happy number.

999505999 is nontrivially palindromic in base 10.

999505999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999505999 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 999505999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999505993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226377 + ... + 230749.

It is an arithmetic number, because the mean of its divisors is an integer number (66029904).

Almost surely, 2^999505999 is an apocalyptic number.

999505999 is a deficient number, since it is larger than the sum of its proper divisors (56972465).

999505999 is a wasteful number, since it uses less digits than its factorization.

999505999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578.

The product of its (nonzero) digits is 13286025, while the sum is 64.

The square root of 999505999 is about 31614.9647951726. The cubic root of 999505999 is about 999.8353058773.

The spelling of 999505999 in words is "nine hundred ninety-nine million, five hundred five thousand, nine hundred ninety-nine".