991133 has 16 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 799680.

The previous prime is 991129. The next prime is 991147. The reversal of 991133 is 331199.

It is a cyclic number.

It is not a de Polignac number, because 991133 - 2² = 991129 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

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 991133.

It is not an unprimeable number, because it can be changed into a prime (991633) 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, 4028 + ... + 4266.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2⁹⁹¹¹³³ is an apocalyptic number.

It is an amenable number.

991133 is a deficient number, since it is larger than the sum of its proper divisors (218467).

991133 is a wasteful number, since it uses less digits than its factorization.

991133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its digits is 729, while the sum is 26.

The square root of 991133 is about 995.5566282236. The cubic root of 991133 is about 99.7035554077.

The spelling of 991133 in words is "nine hundred ninety-one thousand, one hundred thirty-three".