231715 has 12 divisors (see below), whose sum is σ = 306432. Its totient is φ = 168080.

The previous prime is 231709. The next prime is 231719. The reversal of 231715 is 517132.

231715 = T₁₃₄ + T₁₃₅ + ... + T₁₅₅.

It is a de Polignac number, because none of the positive numbers 2^k-231715 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231692 and 231701.

It is not an unprimeable number, because it can be changed into a prime (231719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 414 + ... + 796.

It is an arithmetic number, because the mean of its divisors is an integer number (25536).

2²³¹⁷¹⁵ is an apocalyptic number.

231715 is a deficient number, since it is larger than the sum of its proper divisors (74717).

231715 is a wasteful number, since it uses less digits than its factorization.

231715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 399 counting only the distinct ones).

The product of its digits is 210, while the sum is 19.

The square root of 231715 is about 481.3678427149. The cubic root of 231715 is about 61.4211649882.

Adding to 231715 its reverse (517132), we get a palindrome (748847).

It can be divided in two parts, 2317 and 15, that added together give a palindrome (2332).

The spelling of 231715 in words is "two hundred thirty-one thousand, seven hundred fifteen".