991150120 has 32 divisors (see below), whose sum is σ = 2249833320. Its totient is φ = 392949760.

The previous prime is 991150093. The next prime is 991150141. The reversal of 991150120 is 21051199.

It can be written as a sum of positive squares in 4 ways, for example, as 408120804 + 583029316 = 20202^2 + 24146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105121 + ... + 114160.

Almost surely, 2^991150120 is an apocalyptic number.

It is an amenable number.

991150120 is an abundant number, since it is smaller than the sum of its proper divisors (1258683200).

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

991150120 is a wasteful number, since it uses less digits than its factorization.

991150120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219405 (or 219401 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 991150120 is about 31482.5367465838. The cubic root of 991150120 is about 997.0412946964.

It can be divided in two parts, 9911 and 50120, that added together give a triangular number (60031 = T₃₄₆).

The spelling of 991150120 in words is "nine hundred ninety-one million, one hundred fifty thousand, one hundred twenty".