991193 has 16 divisors (see below), whose sum is σ = 1203840. Its totient is φ = 798336.

The previous prime is 991187. The next prime is 991201. The reversal of 991193 is 391199.

It is not a de Polignac number, because 991193 - 2⁶ = 991129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991493) 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, 11093 + ... + 11181.

It is an arithmetic number, because the mean of its divisors is an integer number (75240).

2⁹⁹¹¹⁹³ is an apocalyptic number.

It is an amenable number.

991193 is a deficient number, since it is larger than the sum of its proper divisors (212647).

991193 is a wasteful number, since it uses less digits than its factorization.

991193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176.

The product of its digits is 2187, while the sum is 32.

The square root of 991193 is about 995.5867616637. The cubic root of 991193 is about 99.7055672779.

The spelling of 991193 in words is "nine hundred ninety-one thousand, one hundred ninety-three".