991294964 has 12 divisors (see below), whose sum is σ = 1892472288. Its totient is φ = 450588600.

The previous prime is 991294919. The next prime is 991294981. The reversal of 991294964 is 469492199.

It is a happy number.

It is a super-2 number, since 2×991294964² = 1965331411303522592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11264672 + ... + 11264759.

It is an arithmetic number, because the mean of its divisors is an integer number (157706024).

Almost surely, 2^991294964 is an apocalyptic number.

It is an amenable number.

991294964 is a deficient number, since it is larger than the sum of its proper divisors (901177324).

991294964 is a wasteful number, since it uses less digits than its factorization.

991294964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22529446 (or 22529444 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The square root of 991294964 is about 31484.8370489669. The cubic root of 991294964 is about 997.0898606375.

The spelling of 991294964 in words is "nine hundred ninety-one million, two hundred ninety-four thousand, nine hundred sixty-four".