13722581 has 2 divisors, whose sum is σ = 13722582. Its totient is φ = 13722580.

The previous prime is 13722571. The next prime is 13722623. The reversal of 13722581 is 18522731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9821956 + 3900625 = 3134^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 13722581 - 2⁶ = 13722517 is a prime.

It is a super-2 number, since 2×13722581² = 376618458603122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13722521) 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, 6861290 + 6861291.

It is an arithmetic number, because the mean of its divisors is an integer number (6861291).

Almost surely, 2^13722581 is an apocalyptic number.

It is an amenable number.

13722581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13722581 is an equidigital number, since it uses as much as digits as its factorization.

13722581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 13722581 is about 3704.4002213584. The cubic root of 13722581 is about 239.4116433211.

The spelling of 13722581 in words is "thirteen million, seven hundred twenty-two thousand, five hundred eighty-one".