91523 has 4 divisors (see below), whose sum is σ = 96360. Its totient is φ = 86688.

The previous prime is 91513. The next prime is 91529. The reversal of 91523 is 32519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32519 = 31 ⋅1049.

It is a cyclic number.

It is not a de Polignac number, because 91523 - 2⁶ = 91459 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91495 and 91504.

It is not an unprimeable number, because it can be changed into a prime (91529) 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, 2390 + ... + 2427.

It is an arithmetic number, because the mean of its divisors is an integer number (24090).

2⁹¹⁵²³ is an apocalyptic number.

91523 is a deficient number, since it is larger than the sum of its proper divisors (4837).

91523 is a wasteful number, since it uses less digits than its factorization.

91523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836.

The product of its digits is 270, while the sum is 20.

The square root of 91523 is about 302.5276846836. The cubic root of 91523 is about 45.0654192532.

The spelling of 91523 in words is "ninety-one thousand, five hundred twenty-three".