13226581 has 8 divisors (see below), whose sum is σ = 13779000. Its totient is φ = 12680640.

The previous prime is 13226579. The next prime is 13226593. The reversal of 13226581 is 18562231.

13226581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2722500 + 10504081 = 1650^2 + 3241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13226581 - 2¹ = 13226579 is a prime.

It is a super-2 number, since 2×13226581² = 349884889899122, 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 (13226531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2791 + ... + 5851.

It is an arithmetic number, because the mean of its divisors is an integer number (1722375).

Almost surely, 2^13226581 is an apocalyptic number.

It is an amenable number.

13226581 is a deficient number, since it is larger than the sum of its proper divisors (552419).

13226581 is a wasteful number, since it uses less digits than its factorization.

13226581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

The product of its digits is 2880, while the sum is 28.

The square root of 13226581 is about 3636.8366749141. The cubic root of 13226581 is about 236.4916793733.

The spelling of 13226581 in words is "thirteen million, two hundred twenty-six thousand, five hundred eighty-one".