13907681 has 2 divisors, whose sum is σ = 13907682. Its totient is φ = 13907680.

The previous prime is 13907603. The next prime is 13907687. The reversal of 13907681 is 18670931.

13907681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10297681 + 3610000 = 3209^2 + 1900^2 .

It is an emirp because it is prime and its reverse (18670931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13907681 - 2¹⁰ = 13906657 is a prime.

It is a super-2 number, since 2×13907681² = 386847181595522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13907687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6953840 + 6953841.

It is an arithmetic number, because the mean of its divisors is an integer number (6953841).

Almost surely, 2^13907681 is an apocalyptic number.

It is an amenable number.

13907681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13907681 is an equidigital number, since it uses as much as digits as its factorization.

13907681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 13907681 is about 3729.3003365243. The cubic root of 13907681 is about 240.4832911832.

The spelling of 13907681 in words is "thirteen million, nine hundred seven thousand, six hundred eighty-one".