231573 has 4 divisors (see below), whose sum is σ = 308768. Its totient is φ = 154380.

The previous prime is 231571. The next prime is 231589. The reversal of 231573 is 375132.

It is a happy number.

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 231573 - 2¹ = 231571 is a prime.

It is a D-number.

It is a Duffinian number.

231573 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231571) 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, 38593 + ... + 38598.

It is an arithmetic number, because the mean of its divisors is an integer number (77192).

2²³¹⁵⁷³ is an apocalyptic number.

It is an amenable number.

231573 is a deficient number, since it is larger than the sum of its proper divisors (77195).

231573 is an equidigital number, since it uses as much as digits as its factorization.

231573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77194.

The product of its digits is 630, while the sum is 21.

The square root of 231573 is about 481.2203237603. The cubic root of 231573 is about 61.4086156817.

It can be divided in two parts, 23 and 1573, that added together give a triangular number (1596 = T₅₆).

The spelling of 231573 in words is "two hundred thirty-one thousand, five hundred seventy-three".