999556117 has 16 divisors (see below), whose sum is σ = 1149782400. Its totient is φ = 851209920.

The previous prime is 999556109. The next prime is 999556193. The reversal of 999556117 is 711655999.

It is a cyclic number.

It is not a de Polignac number, because 999556117 - 2³ = 999556109 is a prime.

It is a super-2 number, since 2×999556117² = 1998224862064235378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999526117) 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, 900759 + ... + 901867.

It is an arithmetic number, because the mean of its divisors is an integer number (71861400).

Almost surely, 2^999556117 is an apocalyptic number.

It is an amenable number.

999556117 is a deficient number, since it is larger than the sum of its proper divisors (150226283).

999556117 is a wasteful number, since it uses less digits than its factorization.

999556117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836.

The product of its digits is 765450, while the sum is 52.

The square root of 999556117 is about 31615.7574161999. The cubic root of 999556117 is about 999.8520171021.

The spelling of 999556117 in words is "nine hundred ninety-nine million, five hundred fifty-six thousand, one hundred seventeen".