91523171 has 4 divisors (see below), whose sum is σ = 96340200. Its totient is φ = 86706144.

The previous prime is 91523161. The next prime is 91523177. The reversal of 91523171 is 17132519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17132519 = 107 ⋅160117.

It is a cyclic number.

It is not a de Polignac number, because 91523171 - 2¹⁰ = 91522147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91523177) 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, 2408486 + ... + 2408523.

It is an arithmetic number, because the mean of its divisors is an integer number (24085050).

Almost surely, 2^91523171 is an apocalyptic number.

91523171 is a deficient number, since it is larger than the sum of its proper divisors (4817029).

91523171 is a wasteful number, since it uses less digits than its factorization.

91523171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817028.

The product of its digits is 1890, while the sum is 29.

The square root of 91523171 is about 9566.7743257589. The cubic root of 91523171 is about 450.6544731970.

The spelling of 91523171 in words is "ninety-one million, five hundred twenty-three thousand, one hundred seventy-one".