13206581 has 2 divisors, whose sum is σ = 13206582. Its totient is φ = 13206580.

The previous prime is 13206563. The next prime is 13206601. The reversal of 13206581 is 18560231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13205956 + 625 = 3634^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 13206581 - 2⁶ = 13206517 is a prime.

It is a super-2 number, since 2×13206581² = 348827563419122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13206581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13206511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6603290 + 6603291.

It is an arithmetic number, because the mean of its divisors is an integer number (6603291).

Almost surely, 2^13206581 is an apocalyptic number.

It is an amenable number.

13206581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13206581 is an equidigital number, since it uses as much as digits as its factorization.

13206581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 13206581 is about 3634.0859923783. The cubic root of 13206581 is about 236.3724190344.

The spelling of 13206581 in words is "thirteen million, two hundred six thousand, five hundred eighty-one".