13993691 has 2 divisors, whose sum is σ = 13993692. Its totient is φ = 13993690.

The previous prime is 13993621. The next prime is 13993699. The reversal of 13993691 is 19639931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13993691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13993699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6996845 + 6996846.

It is an arithmetic number, because the mean of its divisors is an integer number (6996846).

Almost surely, 2^13993691 is an apocalyptic number.

13993691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13993691 is an equidigital number, since it uses as much as digits as its factorization.

13993691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39366, while the sum is 41.

The square root of 13993691 is about 3740.8142161834. The cubic root of 13993691 is about 240.9780171980.

The spelling of 13993691 in words is "thirteen million, nine hundred ninety-three thousand, six hundred ninety-one".