13231213 has 4 divisors (see below), whose sum is σ = 13307868. Its totient is φ = 13154560.

The previous prime is 13231189. The next prime is 13231247. The reversal of 13231213 is 31213231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4919524 + 8311689 = 2218^2 + 2883^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231213 - 2²¹ = 11134061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231313) 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, 38068 + ... + 38413.

It is an arithmetic number, because the mean of its divisors is an integer number (3326967).

Almost surely, 2^13231213 is an apocalyptic number.

It is an amenable number.

13231213 is a deficient number, since it is larger than the sum of its proper divisors (76655).

13231213 is an equidigital number, since it uses as much as digits as its factorization.

13231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76654.

The product of its digits is 108, while the sum is 16.

The square root of 13231213 is about 3637.4734363291. The cubic root of 13231213 is about 236.5192829192.

Adding to 13231213 its reverse (31213231), we get a palindrome (44444444).

The spelling of 13231213 in words is "thirteen million, two hundred thirty-one thousand, two hundred thirteen".