991564343 has 24 divisors (see below), whose sum is σ = 1324552320. Its totient is φ = 731974320.

The previous prime is 991564331. The next prime is 991564349. The reversal of 991564343 is 343465199.

991564343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 991564343 - 2⁶ = 991564279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 991564294 and 991564303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991564349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38171 + ... + 58652.

It is an arithmetic number, because the mean of its divisors is an integer number (55189680).

Almost surely, 2^991564343 is an apocalyptic number.

991564343 is a deficient number, since it is larger than the sum of its proper divisors (332987977).

991564343 is a wasteful number, since it uses less digits than its factorization.

991564343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96867 (or 96860 counting only the distinct ones).

The product of its digits is 349920, while the sum is 44.

The square root of 991564343 is about 31489.1146747571. The cubic root of 991564343 is about 997.1801703681.

The spelling of 991564343 in words is "nine hundred ninety-one million, five hundred sixty-four thousand, three hundred forty-three".