9011997157 has 16 divisors (see below), whose sum is σ = 9249831360. Its totient is φ = 8778067200.

The previous prime is 9011997133. The next prime is 9011997173. The reversal of 9011997157 is 7517991109.

9011997157 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9011997157 - 2²⁷ = 8877779429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9011997157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9011997107) 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, 1906557 + ... + 1911277.

It is an arithmetic number, because the mean of its divisors is an integer number (578114460).

Almost surely, 2^9011997157 is an apocalyptic number.

It is an amenable number.

9011997157 is a deficient number, since it is larger than the sum of its proper divisors (237834203).

9011997157 is a wasteful number, since it uses less digits than its factorization.

9011997157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124.

The product of its (nonzero) digits is 178605, while the sum is 49.

The square root of 9011997157 is about 94931.5393164990. The cubic root of 9011997157 is about 2081.0076753437.

The spelling of 9011997157 in words is "nine billion, eleven million, nine hundred ninety-seven thousand, one hundred fifty-seven".