13229581 has 2 divisors, whose sum is σ = 13229582. Its totient is φ = 13229580.

The previous prime is 13229549. The next prime is 13229617. The reversal of 13229581 is 18592231.

13229581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 2280100 = 3309^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 13229581 - 2⁵ = 13229549 is a prime.

It is a super-2 number, since 2×13229581² = 350043626871122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13229521) 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 as a sum of consecutive naturals, namely, 6614790 + 6614791.

It is an arithmetic number, because the mean of its divisors is an integer number (6614791).

Almost surely, 2^13229581 is an apocalyptic number.

It is an amenable number.

13229581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13229581 is an equidigital number, since it uses as much as digits as its factorization.

13229581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 13229581 is about 3637.2490978760. The cubic root of 13229581 is about 236.5095580527.

The spelling of 13229581 in words is "thirteen million, two hundred twenty-nine thousand, five hundred eighty-one".