1091193312 has 96 divisors (see below), whose sum is σ = 3137460480. Its totient is φ = 329323520.

The previous prime is 1091193287. The next prime is 1091193319. The reversal of 1091193312 is 2133911901.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 1091193312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091193319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275764 + ... + 279692.

It is an arithmetic number, because the mean of its divisors is an integer number (32681880).

Almost surely, 2^1091193312 is an apocalyptic number.

1091193312 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 1091193312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1568730240).

1091193312 is an abundant number, since it is smaller than the sum of its proper divisors (2046267168).

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

1091193312 is a wasteful number, since it uses less digits than its factorization.

1091193312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 1091193312 is about 33033.2152840138. The cubic root of 1091193312 is about 1029.5178916983.

The spelling of 1091193312 in words is "one billion, ninety-one million, one hundred ninety-three thousand, three hundred twelve".