991193160 has 128 divisors (see below), whose sum is σ = 3173385600. Its totient is φ = 246804480.

The previous prime is 991193009. The next prime is 991193183. The reversal of 991193160 is 61391199.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265386 + ... + 269094.

It is an arithmetic number, because the mean of its divisors is an integer number (24792075).

Almost surely, 2^991193160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991193160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1586692800).

991193160 is an abundant number, since it is smaller than the sum of its proper divisors (2182192440).

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

991193160 is a wasteful number, since it uses less digits than its factorization.

991193160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3867 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 991193160 is about 31483.2202927210. The cubic root of 991193160 is about 997.0557264275.

The spelling of 991193160 in words is "nine hundred ninety-one million, one hundred ninety-three thousand, one hundred sixty".