991152580 has 48 divisors (see below), whose sum is σ = 2323468224. Its totient is φ = 352033920.

The previous prime is 991152557. The next prime is 991152601. The reversal of 991152580 is 85251199.

991152580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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, 42927 + ... + 61846.

It is an arithmetic number, because the mean of its divisors is an integer number (48405588).

Almost surely, 2^991152580 is an apocalyptic number.

It is an amenable number.

991152580 is an abundant number, since it is smaller than the sum of its proper divisors (1332315644).

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

991152580 is a wasteful number, since it uses less digits than its factorization.

991152580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104836 (or 104834 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 991152580 is about 31482.5758158382. The cubic root of 991152580 is about 997.0421195696.

The spelling of 991152580 in words is "nine hundred ninety-one million, one hundred fifty-two thousand, five hundred eighty".