13213261 has 4 divisors (see below), whose sum is σ = 13220892. Its totient is φ = 13205632.

The previous prime is 13213259. The next prime is 13213273. The reversal of 13213261 is 16231231.

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 can be written as a sum of positive squares in 2 ways, for example, as 8590761 + 4622500 = 2931^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 13213261 - 2¹ = 13213259 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 (13213231) 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, 171 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (3305223).

Almost surely, 2^13213261 is an apocalyptic number.

It is an amenable number.

13213261 is a deficient number, since it is larger than the sum of its proper divisors (7631).

13213261 is an equidigital number, since it uses as much as digits as its factorization.

13213261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630.

The product of its digits is 216, while the sum is 19.

The square root of 13213261 is about 3635.0049518536. The cubic root of 13213261 is about 236.4122653710.

Adding to 13213261 its reverse (16231231), we get a palindrome (29444492).

The spelling of 13213261 in words is "thirteen million, two hundred thirteen thousand, two hundred sixty-one".