13691963 has 2 divisors, whose sum is σ = 13691964. Its totient is φ = 13691962.

The previous prime is 13691947. The next prime is 13691981. The reversal of 13691963 is 36919631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13691963 - 2⁴ = 13691947 is a prime.

It is not a weakly prime, because it can be changed into another prime (13691903) 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, 6845981 + 6845982.

It is an arithmetic number, because the mean of its divisors is an integer number (6845982).

Almost surely, 2^13691963 is an apocalyptic number.

13691963 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691963 is an equidigital number, since it uses as much as digits as its factorization.

13691963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 13691963 is about 3700.2652607617. The cubic root of 13691963 is about 239.2334512767.

The spelling of 13691963 in words is "thirteen million, six hundred ninety-one thousand, nine hundred sixty-three".