9011997156 has 24 divisors (see below), whose sum is σ = 21120634080. Its totient is φ = 2990764672.

The previous prime is 9011997133. The next prime is 9011997173. The reversal of 9011997156 is 6517991109.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1651461 + ... + 1656908.

It is an arithmetic number, because the mean of its divisors is an integer number (880026420).

Almost surely, 2^9011997156 is an apocalyptic number.

It is an amenable number.

9011997156 is an abundant number, since it is smaller than the sum of its proper divisors (12108636924).

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

9011997156 is a wasteful number, since it uses less digits than its factorization.

9011997156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308603 (or 3308601 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 48.

The square root of 9011997156 is about 94931.5393112321. The cubic root of 9011997156 is about 2081.0076752667.

The spelling of 9011997156 in words is "nine billion, eleven million, nine hundred ninety-seven thousand, one hundred fifty-six".