13861691 has 2 divisors, whose sum is σ = 13861692. Its totient is φ = 13861690.

The previous prime is 13861667. The next prime is 13861693. The reversal of 13861691 is 19616831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13861691 - 2¹⁰ = 13860667 is a prime.

Together with 13861693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13861693) 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, 6930845 + 6930846.

It is an arithmetic number, because the mean of its divisors is an integer number (6930846).

Almost surely, 2^13861691 is an apocalyptic number.

13861691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13861691 is an equidigital number, since it uses as much as digits as its factorization.

13861691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 13861691 is about 3723.1291946426. The cubic root of 13861691 is about 240.2179212794.

The spelling of 13861691 in words is "thirteen million, eight hundred sixty-one thousand, six hundred ninety-one".