231615 has 12 divisors (see below), whose sum is σ = 401544. Its totient is φ = 123504.

The previous prime is 231613. The next prime is 231631. The reversal of 231615 is 516132.

It is not a de Polignac number, because 231615 - 2¹ = 231613 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2529 + ... + 2618.

It is an arithmetic number, because the mean of its divisors is an integer number (33462).

2²³¹⁶¹⁵ is an apocalyptic number.

231615 is a deficient number, since it is larger than the sum of its proper divisors (169929).

231615 is a wasteful number, since it uses less digits than its factorization.

231615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158 (or 5155 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 231615 is about 481.2639608365. The cubic root of 231615 is about 61.4123279826.

Adding to 231615 its reverse (516132), we get a palindrome (747747).

The spelling of 231615 in words is "two hundred thirty-one thousand, six hundred fifteen".