991450164 has 12 divisors (see below), whose sum is σ = 2313383744. Its totient is φ = 330483384.

The previous prime is 991450147. The next prime is 991450169. The reversal of 991450164 is 461054199.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991450169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41310412 + ... + 41310435.

Almost surely, 2^991450164 is an apocalyptic number.

It is an amenable number.

991450164 is an abundant number, since it is smaller than the sum of its proper divisors (1321933580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991450164 is a wasteful number, since it uses less digits than its factorization.

991450164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82620854 (or 82620852 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 991450164 is about 31487.3016309750. The cubic root of 991450164 is about 997.1418936773.

The spelling of 991450164 in words is "nine hundred ninety-one million, four hundred fifty thousand, one hundred sixty-four".