231542 has 4 divisors (see below), whose sum is σ = 347316. Its totient is φ = 115770.

The previous prime is 231533. The next prime is 231547. The reversal of 231542 is 245132.

231542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×231542² = 107223395528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231542.

It is a congruent number.

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

231542 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 as a sum of consecutive naturals, namely, 57884 + ... + 57887.

It is an arithmetic number, because the mean of its divisors is an integer number (86829).

2²³¹⁵⁴² is an apocalyptic number.

231542 is a deficient number, since it is larger than the sum of its proper divisors (115774).

231542 is a wasteful number, since it uses less digits than its factorization.

231542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115773.

The product of its digits is 240, while the sum is 17.

The square root of 231542 is about 481.1881129039. The cubic root of 231542 is about 61.4058753622.

Adding to 231542 its reverse (245132), we get a palindrome (476674).

The spelling of 231542 in words is "two hundred thirty-one thousand, five hundred forty-two".