1191591104 has 42 divisors (see below), whose sum is σ = 2581508172. Its totient is φ = 541216000.

The previous prime is 1191591101. The next prime is 1191591119. The reversal of 1191591104 is 4011951911.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1191591101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 915254 + ... + 916554.

Almost surely, 2^1191591104 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 1191591104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290754086).

1191591104 is an abundant number, since it is smaller than the sum of its proper divisors (1389917068).

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

1191591104 is an frugal number, since it uses more digits than its factorization.

1191591104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 32.

The square root of 1191591104 is about 34519.4308180190. The cubic root of 1191591104 is about 1060.1705860503.

It can be divided in two parts, 1191 and 591104, that added together give a palindrome (592295).

The spelling of 1191591104 in words is "one billion, one hundred ninety-one million, five hundred ninety-one thousand, one hundred four".