13313231 has 4 divisors (see below), whose sum is σ = 13320552. Its totient is φ = 13305912.

The previous prime is 13313221. The next prime is 13313257. The reversal of 13313231 is 13231331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13313231 - 2²² = 9118927 is a prime.

It is a super-2 number, since 2×13313231² = 354484239318722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13313221) 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, 1400 + ... + 5346.

It is an arithmetic number, because the mean of its divisors is an integer number (3330138).

Almost surely, 2^13313231 is an apocalyptic number.

13313231 is a deficient number, since it is larger than the sum of its proper divisors (7321).

13313231 is an equidigital number, since it uses as much as digits as its factorization.

13313231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320.

The product of its digits is 162, while the sum is 17.

The square root of 13313231 is about 3648.7300530459. The cubic root of 13313231 is about 237.0069906013.

Adding to 13313231 its reverse (13231331), we get a palindrome (26544562).

The spelling of 13313231 in words is "thirteen million, three hundred thirteen thousand, two hundred thirty-one".