231544 has 16 divisors (see below), whose sum is σ = 439920. Its totient is φ = 114240.

The previous prime is 231533. The next prime is 231547. The reversal of 231544 is 445132.

It is a super-2 number, since 2×231544² = 107225247872, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231547) by changing a digit.

231544 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684 + ... + 964.

It is an arithmetic number, because the mean of its divisors is an integer number (27495).

2²³¹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

231544 is a deficient number, since it is larger than the sum of its proper divisors (208376).

231544 is a wasteful number, since it uses less digits than its factorization.

231544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 386 counting only the distinct ones).

The product of its digits is 480, while the sum is 19.

The square root of 231544 is about 481.1901910887. The cubic root of 231544 is about 61.4060521644.

Adding to 231544 its reverse (445132), we get a palindrome (676676).

The spelling of 231544 in words is "two hundred thirty-one thousand, five hundred forty-four".