1115991912 has 64 divisors (see below), whose sum is σ = 3192583680. Its totient is φ = 318451392.

The previous prime is 1115991893. The next prime is 1115991913. The reversal of 1115991912 is 2191995111.

It is not an unprimeable number, because it can be changed into a prime (1115991913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144583 + ... + 152105.

It is an arithmetic number, because the mean of its divisors is an integer number (49884120).

Almost surely, 2^1115991912 is an apocalyptic number.

1115991912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1115991912 is an abundant number, since it is smaller than the sum of its proper divisors (2076591768).

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

1115991912 is a wasteful number, since it uses less digits than its factorization.

1115991912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8422 (or 8418 counting only the distinct ones).

The product of its digits is 7290, while the sum is 39.

The square root of 1115991912 is about 33406.4651227872. The cubic root of 1115991912 is about 1037.2585317374.

The spelling of 1115991912 in words is "one billion, one hundred fifteen million, nine hundred ninety-one thousand, nine hundred twelve".