991104120 has 64 divisors (see below), whose sum is σ = 3303684000. Its totient is φ = 264294144.

The previous prime is 991104113. The next prime is 991104139. The reversal of 991104120 is 21401199.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457765 + ... + 459924.

Almost surely, 2^991104120 is an apocalyptic number.

991104120 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

991104120 is an abundant number, since it is smaller than the sum of its proper divisors (2312579880).

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

991104120 is a wasteful number, since it uses less digits than its factorization.

991104120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917709 (or 917699 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 991104120 is about 31481.8061743605. The cubic root of 991104120 is about 997.0258699865.

It can be divided in two parts, 991 and 104120, that added together give a triangular number (105111 = T₄₅₈).

The spelling of 991104120 in words is "nine hundred ninety-one million, one hundred four thousand, one hundred twenty".