991158 has 16 divisors (see below), whose sum is σ = 2265600. Its totient is φ = 283176.

The previous prime is 991147. The next prime is 991171. The reversal of 991158 is 851199.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991158.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11758 + ... + 11841.

It is an arithmetic number, because the mean of its divisors is an integer number (141600).

2⁹⁹¹¹⁵⁸ is an apocalyptic number.

991158 is an abundant number, since it is smaller than the sum of its proper divisors (1274442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991158 is a wasteful number, since it uses less digits than its factorization.

991158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23611.

The product of its digits is 3240, while the sum is 33.

The square root of 991158 is about 995.5691839345. The cubic root of 991158 is about 99.7043936968.

The spelling of 991158 in words is "nine hundred ninety-one thousand, one hundred fifty-eight".