231520165 has 16 divisors (see below), whose sum is σ = 286675200. Its totient is φ = 179404992.

The previous prime is 231520129. The next prime is 231520171. The reversal of 231520165 is 561025132.

It is a cyclic number.

It is not a de Polignac number, because 231520165 - 2¹¹ = 231518117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15406 + ... + 26464.

It is an arithmetic number, because the mean of its divisors is an integer number (17917200).

Almost surely, 2^231520165 is an apocalyptic number.

It is an amenable number.

231520165 is a deficient number, since it is larger than the sum of its proper divisors (55155035).

231520165 is a wasteful number, since it uses less digits than its factorization.

231520165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 231520165 is about 15215.7867032894. The cubic root of 231520165 is about 614.0394505805.

Adding to 231520165 its reverse (561025132), we get a palindrome (792545297).

The spelling of 231520165 in words is "two hundred thirty-one million, five hundred twenty thousand, one hundred sixty-five".