999718913 has 4 divisors (see below), whose sum is σ = 1018581588. Its totient is φ = 980856240.

The previous prime is 999718883. The next prime is 999718921. The reversal of 999718913 is 319817999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 660901264 + 338817649 = 25708^2 + 18407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999718913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999712913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9431258 + ... + 9431363.

It is an arithmetic number, because the mean of its divisors is an integer number (254645397).

It is a Proth number, since it is equal to 30509 ⋅ 2¹⁵ + 1 and 30509 < 2¹⁵.

Almost surely, 2^999718913 is an apocalyptic number.

It is an amenable number.

999718913 is a deficient number, since it is larger than the sum of its proper divisors (18862675).

999718913 is a wasteful number, since it uses less digits than its factorization.

999718913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18862674.

The product of its digits is 1102248, while the sum is 56.

The square root of 999718913 is about 31618.3319136225. The cubic root of 999718913 is about 999.9062955531.

The spelling of 999718913 in words is "nine hundred ninety-nine million, seven hundred eighteen thousand, nine hundred thirteen".