91116157 has 4 divisors (see below), whose sum is σ = 99399456. Its totient is φ = 82832860.

The previous prime is 91116139. The next prime is 91116167. The reversal of 91116157 is 75161119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91116157 - 2¹⁵ = 91083389 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 (91116167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4141633 + ... + 4141654.

It is an arithmetic number, because the mean of its divisors is an integer number (24849864).

Almost surely, 2^91116157 is an apocalyptic number.

It is an amenable number.

91116157 is a deficient number, since it is larger than the sum of its proper divisors (8283299).

91116157 is a wasteful number, since it uses less digits than its factorization.

91116157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8283298.

The product of its digits is 1890, while the sum is 31.

The square root of 91116157 is about 9545.4783536500. The cubic root of 91116157 is about 449.9854431505.

The spelling of 91116157 in words is "ninety-one million, one hundred sixteen thousand, one hundred fifty-seven".