991119 has 8 divisors (see below), whose sum is σ = 1357360. Its totient is φ = 642816.

The previous prime is 991091. The next prime is 991127. The reversal of 991119 is 911199.

991119 is nontrivially palindromic in base 2.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991119 - 2¹¹ = 989071 is a prime.

It is a super-2 number, since 2×991119² = 1964633744322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4354 + ... + 4575.

It is an arithmetic number, because the mean of its divisors is an integer number (169670).

2⁹⁹¹¹¹⁹ is an apocalyptic number.

991119 is a deficient number, since it is larger than the sum of its proper divisors (366241).

991119 is a wasteful number, since it uses less digits than its factorization.

991119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8969.

The product of its digits is 729, while the sum is 30.

The square root of 991119 is about 995.5495969564. The cubic root of 991119 is about 99.7030859597.

The spelling of 991119 in words is "nine hundred ninety-one thousand, one hundred nineteen".