231523 has 4 divisors (see below), whose sum is σ = 245160. Its totient is φ = 217888.

The previous prime is 231503. The next prime is 231529. The reversal of 231523 is 325132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231523 - 2¹³ = 223331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231497 and 231506.

It is not an unprimeable number, because it can be changed into a prime (231529) 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, 6793 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (61290).

2²³¹⁵²³ is an apocalyptic number.

231523 is a deficient number, since it is larger than the sum of its proper divisors (13637).

231523 is a wasteful number, since it uses less digits than its factorization.

231523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13636.

The product of its digits is 180, while the sum is 16.

The square root of 231523 is about 481.1683697003. The cubic root of 231523 is about 61.4041956906.

Adding to 231523 its reverse (325132), we get a palindrome (556655).

The spelling of 231523 in words is "two hundred thirty-one thousand, five hundred twenty-three".