13165231 has 4 divisors (see below), whose sum is σ = 13198464. Its totient is φ = 13132000.

The previous prime is 13165213. The next prime is 13165241. The reversal of 13165231 is 13256131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13256131 = 7 ⋅1893733.

It is a cyclic number.

It is not a de Polignac number, because 13165231 - 2⁹ = 13164719 is a prime.

It is a super-2 number, since 2×13165231² = 346646614566722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13165241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16015 + ... + 16816.

It is an arithmetic number, because the mean of its divisors is an integer number (3299616).

Almost surely, 2^13165231 is an apocalyptic number.

13165231 is a deficient number, since it is larger than the sum of its proper divisors (33233).

13165231 is an equidigital number, since it uses as much as digits as its factorization.

13165231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33232.

The product of its digits is 540, while the sum is 22.

The square root of 13165231 is about 3628.3923437247. The cubic root of 13165231 is about 236.1254659395.

The spelling of 13165231 in words is "thirteen million, one hundred sixty-five thousand, two hundred thirty-one".