13317231 has 4 divisors (see below), whose sum is σ = 17756312. Its totient is φ = 8878152.

The previous prime is 13317217. The next prime is 13317277. The reversal of 13317231 is 13271331.

13317231 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13317231 - 2¹⁸ = 13055087 is a prime.

It is a super-2 number, since 2×13317231² = 354697283014722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13317198 and 13317207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13312231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2219536 + ... + 2219541.

It is an arithmetic number, because the mean of its divisors is an integer number (4439078).

Almost surely, 2^13317231 is an apocalyptic number.

13317231 is a deficient number, since it is larger than the sum of its proper divisors (4439081).

13317231 is an equidigital number, since it uses as much as digits as its factorization.

13317231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439080.

The product of its digits is 378, while the sum is 21.

The square root of 13317231 is about 3649.2781477985. The cubic root of 13317231 is about 237.0307247104.

Adding to 13317231 its reverse (13271331), we get a palindrome (26588562).

The spelling of 13317231 in words is "thirteen million, three hundred seventeen thousand, two hundred thirty-one".