9891157 has 6 divisors (see below), whose sum is σ = 9993974. Its totient is φ = 9789000.

The previous prime is 9891151. The next prime is 9891179. The reversal of 9891157 is 7511989.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 2268036 = 2761^2 + 1506^2 .

It is not a de Polignac number, because 9891157 - 2³ = 9891149 is a prime.

It is a Duffinian number.

9891157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39282 + ... + 39532.

Almost surely, 2^9891157 is an apocalyptic number.

It is an amenable number.

9891157 is a deficient number, since it is larger than the sum of its proper divisors (102817).

9891157 is an equidigital number, since it uses as much as digits as its factorization.

9891157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 408 counting only the distinct ones).

The product of its digits is 22680, while the sum is 40.

The square root of 9891157 is about 3145.0209856216. The cubic root of 9891157 is about 214.6589653736.

The spelling of 9891157 in words is "nine million, eight hundred ninety-one thousand, one hundred fifty-seven".