91198157 has 8 divisors (see below), whose sum is σ = 96932160. Its totient is φ = 85557600.

The previous prime is 91198147. The next prime is 91198171. The reversal of 91198157 is 75189119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91198157 - 2⁸ = 91197901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91198147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21344 + ... + 25257.

It is an arithmetic number, because the mean of its divisors is an integer number (12116520).

Almost surely, 2^91198157 is an apocalyptic number.

It is an amenable number.

91198157 is a deficient number, since it is larger than the sum of its proper divisors (5734003).

91198157 is a wasteful number, since it uses less digits than its factorization.

91198157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46723.

The product of its digits is 22680, while the sum is 41.

The square root of 91198157 is about 9549.7726150940. The cubic root of 91198157 is about 450.1203908336.

The spelling of 91198157 in words is "ninety-one million, one hundred ninety-eight thousand, one hundred fifty-seven".