231523542 has 16 divisors (see below), whose sum is σ = 514496880. Its totient is φ = 77174496.

The previous prime is 231523517. The next prime is 231523547. The reversal of 231523542 is 245325132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231523547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2143683 + ... + 2143790.

It is an arithmetic number, because the mean of its divisors is an integer number (32156055).

Almost surely, 2^231523542 is an apocalyptic number.

231523542 is an abundant number, since it is smaller than the sum of its proper divisors (282973338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231523542 is a wasteful number, since it uses less digits than its factorization.

231523542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287484 (or 4287478 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 231523542 is about 15215.8976731575. The cubic root of 231523542 is about 614.0424360672.

Adding to 231523542 its reverse (245325132), we get a palindrome (476848674).

The spelling of 231523542 in words is "two hundred thirty-one million, five hundred twenty-three thousand, five hundred forty-two".