991669194 has 48 divisors (see below), whose sum is σ = 2285936640. Its totient is φ = 309617280.

The previous prime is 991669163. The next prime is 991669201. The reversal of 991669194 is 491966199.

It is a self number, because there is not a number n which added to its sum of digits gives 991669194.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56887 + ... + 72245.

It is an arithmetic number, because the mean of its divisors is an integer number (47623680).

Almost surely, 2^991669194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991669194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142968320).

991669194 is an abundant number, since it is smaller than the sum of its proper divisors (1294267446).

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

991669194 is a wasteful number, since it uses less digits than its factorization.

991669194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15595 (or 15592 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 991669194 is about 31490.7795076591. The cubic root of 991669194 is about 997.2153174074.

The spelling of 991669194 in words is "nine hundred ninety-one million, six hundred sixty-nine thousand, one hundred ninety-four".