1191791232 has 160 divisors (see below), whose sum is σ = 3598927200. Its totient is φ = 391426560.

The previous prime is 1191791219. The next prime is 1191791261. The reversal of 1191791232 is 2321971911.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 735319 + ... + 736937.

It is an arithmetic number, because the mean of its divisors is an integer number (22493295).

Almost surely, 2^1191791232 is an apocalyptic number.

1191791232 is a gapful number since it is divisible by the number (12) 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 1191791232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799463600).

1191791232 is an abundant number, since it is smaller than the sum of its proper divisors (2407135968).

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

1191791232 is an equidigital number, since it uses as much as digits as its factorization.

1191791232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716 (or 1695 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 1191791232 is about 34522.3294694897. The cubic root of 1191791232 is about 1060.2299346925.

The spelling of 1191791232 in words is "one billion, one hundred ninety-one million, seven hundred ninety-one thousand, two hundred thirty-two".