1121556996 has 192 divisors, whose sum is σ = 3419136000. Its totient is φ = 311351040.

The previous prime is 1121556959. The next prime is 1121557001. The reversal of 1121556996 is 6996551211.

It is a happy number.

1121556996 is a `hidden beast` number, since 1 + 1 + 2 + 1 + 556 + 9 + 96 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5315331 + ... + 5315541.

It is an arithmetic number, because the mean of its divisors is an integer number (17808000).

Almost surely, 2^1121556996 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 1121556996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709568000).

1121556996 is an abundant number, since it is smaller than the sum of its proper divisors (2297579004).

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

1121556996 is a wasteful number, since it uses less digits than its factorization.

1121556996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 391 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 1121556996 is about 33489.6550594359. The cubic root of 1121556996 is about 1038.9798292427.

The spelling of 1121556996 in words is "one billion, one hundred twenty-one million, five hundred fifty-six thousand, nine hundred ninety-six".