231515 has 8 divisors (see below), whose sum is σ = 292560. Its totient is φ = 175392.

The previous prime is 231503. The next prime is 231529. The reversal of 231515 is 515132.

231515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231515 - 2¹² = 227419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231493 and 231502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1124 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (36570).

2²³¹⁵¹⁵ is an apocalyptic number.

231515 is a deficient number, since it is larger than the sum of its proper divisors (61045).

231515 is a wasteful number, since it uses less digits than its factorization.

231515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461.

The product of its digits is 150, while the sum is 17.

The square root of 231515 is about 481.1600565300. The cubic root of 231515 is about 61.4034884330.

Adding to 231515 its reverse (515132), we get a palindrome (746647).

The spelling of 231515 in words is "two hundred thirty-one thousand, five hundred fifteen".