13908581 has 2 divisors, whose sum is σ = 13908582. Its totient is φ = 13908580.

The previous prime is 13908571. The next prime is 13908599. The reversal of 13908581 is 18580931.

13908581 is digitally balanced in base 2, 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., 8755681 + 5152900 = 2959^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 13908581 - 2¹⁰ = 13907557 is a prime.

It is a super-2 number, since 2×13908581² = 386897250867122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13908511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6954290 + 6954291.

It is an arithmetic number, because the mean of its divisors is an integer number (6954291).

Almost surely, 2^13908581 is an apocalyptic number.

It is an amenable number.

13908581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13908581 is an equidigital number, since it uses as much as digits as its factorization.

13908581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 13908581 is about 3729.4210006380. The cubic root of 13908581 is about 240.4884784916.

The spelling of 13908581 in words is "thirteen million, nine hundred eight thousand, five hundred eighty-one".