1121581296 has 160 divisors (see below), whose sum is σ = 3607507200. Its totient is φ = 330635520.

The previous prime is 1121581289. The next prime is 1121581297. The reversal of 1121581296 is 6921851211.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1121581296.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121581297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172635 + ... + 179013.

It is an arithmetic number, because the mean of its divisors is an integer number (22546920).

Almost surely, 2^1121581296 is an apocalyptic number.

1121581296 is a gapful number since it is divisible by the number (16) 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 1121581296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1803753600).

1121581296 is an abundant number, since it is smaller than the sum of its proper divisors (2485925904).

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

1121581296 is a wasteful number, since it uses less digits than its factorization.

1121581296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444 (or 6432 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 1121581296 is about 33490.0178560717. The cubic root of 1121581296 is about 1038.9873328077.

The spelling of 1121581296 in words is "one billion, one hundred twenty-one million, five hundred eighty-one thousand, two hundred ninety-six".