991364 has 12 divisors (see below), whose sum is σ = 1892688. Its totient is φ = 450600.

The previous prime is 991357. The next prime is 991381. The reversal of 991364 is 463199.

It is a self number, because there is not a number n which added to its sum of digits gives 991364.

It is an unprimeable number.

991364 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11222 + ... + 11309.

It is an arithmetic number, because the mean of its divisors is an integer number (157724).

2⁹⁹¹³⁶⁴ is an apocalyptic number.

It is an amenable number.

991364 is a deficient number, since it is larger than the sum of its proper divisors (901324).

991364 is a wasteful number, since it uses less digits than its factorization.

991364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22546 (or 22544 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 991364 is about 995.6726369646. The cubic root of 991364 is about 99.7113006623.

The spelling of 991364 in words is "nine hundred ninety-one thousand, three hundred sixty-four".