991179 has 12 divisors (see below), whose sum is σ = 1636336. Its totient is φ = 566352.

The previous prime is 991171. The next prime is 991181. The reversal of 991179 is 971199.

It is not a de Polignac number, because 991179 - 2³ = 991171 is a prime.

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

It is a Duffinian number.

991179 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (991171) 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, 7804 + ... + 7929.

2⁹⁹¹¹⁷⁹ is an apocalyptic number.

991179 is a deficient number, since it is larger than the sum of its proper divisors (645157).

991179 is a wasteful number, since it uses less digits than its factorization.

991179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15746 (or 15743 counting only the distinct ones).

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

The square root of 991179 is about 995.5797306093. The cubic root of 991179 is about 99.7050978488.

The spelling of 991179 in words is "nine hundred ninety-one thousand, one hundred seventy-nine".