999117 has 12 divisors (see below), whose sum is σ = 1649440. Its totient is φ = 570888.

The previous prime is 999101. The next prime is 999133. The reversal of 999117 is 711999.

It is an interprime number because it is at equal distance from previous prime (999101) and next prime (999133).

It is not a de Polignac number, because 999117 - 2⁴ = 999101 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

999117 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7867 + ... + 7992.

2⁹⁹⁹¹¹⁷ is an apocalyptic number.

It is an amenable number.

999117 is a deficient number, since it is larger than the sum of its proper divisors (650323).

999117 is a wasteful number, since it uses less digits than its factorization.

999117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15872 (or 15869 counting only the distinct ones).

The product of its digits is 5103, while the sum is 36.

The square root of 999117 is about 999.5584024958. The cubic root of 999117 is about 99.9705579992.

It can be divided in two parts, 99 and 9117, that added together give a square (9216 = 96²).

The spelling of 999117 in words is "nine hundred ninety-nine thousand, one hundred seventeen".