991104156 has 36 divisors (see below), whose sum is σ = 2863190512. Its totient is φ = 283172544.

The previous prime is 991104143. The next prime is 991104161. The reversal of 991104156 is 651401199.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 991104156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1966225 + ... + 1966728.

Almost surely, 2^991104156 is an apocalyptic number.

It is an amenable number.

991104156 is an abundant number, since it is smaller than the sum of its proper divisors (1872086356).

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

991104156 is a wasteful number, since it uses less digits than its factorization.

991104156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932970 (or 3932965 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 991104156 is about 31481.8067461193. The cubic root of 991104156 is about 997.0258820582.

The spelling of 991104156 in words is "nine hundred ninety-one million, one hundred four thousand, one hundred fifty-six".