1191312320 has 112 divisors (see below), whose sum is σ = 3124614528. Its totient is φ = 429020160.

The previous prime is 1191312319. The next prime is 1191312401. The reversal of 1191312320 is 232131911.

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, 375059 + ... + 378221.

It is an arithmetic number, because the mean of its divisors is an integer number (27898344).

Almost surely, 2^1191312320 is an apocalyptic number.

1191312320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1191312320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562307264).

1191312320 is an abundant number, since it is smaller than the sum of its proper divisors (1933302208).

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

1191312320 is a wasteful number, since it uses less digits than its factorization.

1191312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298 (or 3288 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1191312320 is about 34515.3925082709. The cubic root of 1191312320 is about 1060.0879006257.

The spelling of 1191312320 in words is "one billion, one hundred ninety-one million, three hundred twelve thousand, three hundred twenty".