13699991 has 2 divisors, whose sum is σ = 13699992. Its totient is φ = 13699990.

The previous prime is 13699981. The next prime is 13699997. The reversal of 13699991 is 19999631.

13699991 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 is an emirp because it is prime and its reverse (19999631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13699991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13699997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6849995 + 6849996.

It is an arithmetic number, because the mean of its divisors is an integer number (6849996).

Almost surely, 2^13699991 is an apocalyptic number.

13699991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13699991 is an equidigital number, since it uses as much as digits as its factorization.

13699991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 47.

The square root of 13699991 is about 3701.3498888919. The cubic root of 13699991 is about 239.2801986742.

The spelling of 13699991 in words is "thirteen million, six hundred ninety-nine thousand, nine hundred ninety-one".