231615505 has 16 divisors (see below), whose sum is σ = 303660864. Its totient is φ = 168194880.

The previous prime is 231615413. The next prime is 231615511. The reversal of 231615505 is 505516132.

It is not a de Polignac number, because 231615505 - 2¹⁵ = 231582737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38854 + ... + 44416.

It is an arithmetic number, because the mean of its divisors is an integer number (18978804).

Almost surely, 2^231615505 is an apocalyptic number.

It is an amenable number.

231615505 is a deficient number, since it is larger than the sum of its proper divisors (72045359).

231615505 is a wasteful number, since it uses less digits than its factorization.

231615505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 231615505 is about 15218.9193111732. The cubic root of 231615505 is about 614.1237261584.

The spelling of 231615505 in words is "two hundred thirty-one million, six hundred fifteen thousand, five hundred five".