231115215 has 16 divisors (see below), whose sum is σ = 377653248. Its totient is φ = 120638496.

The previous prime is 231115189. The next prime is 231115219. The reversal of 231115215 is 512511132.

It is not a de Polignac number, because 231115215 - 2¹¹ = 231113167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231115191 and 231115200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231115219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163207 + ... + 164616.

It is an arithmetic number, because the mean of its divisors is an integer number (23603328).

Almost surely, 2^231115215 is an apocalyptic number.

231115215 is a deficient number, since it is larger than the sum of its proper divisors (146538033).

231115215 is a wasteful number, since it uses less digits than its factorization.

231115215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327878.

The product of its digits is 300, while the sum is 21.

The square root of 231115215 is about 15202.4739762974. The cubic root of 231115215 is about 613.6812378806.

Adding to 231115215 its reverse (512511132), we get a palindrome (743626347).

The spelling of 231115215 in words is "two hundred thirty-one million, one hundred fifteen thousand, two hundred fifteen".