13691941 has 2 divisors, whose sum is σ = 13691942. Its totient is φ = 13691940.

The previous prime is 13691939. The next prime is 13691947. The reversal of 13691941 is 14919631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9947716 + 3744225 = 3154^2 + 1935^2 .

It is an emirp because it is prime and its reverse (14919631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13691941 - 2¹ = 13691939 is a prime.

Together with 13691939, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13691897 and 13691906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13691947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6845970 + 6845971.

It is an arithmetic number, because the mean of its divisors is an integer number (6845971).

Almost surely, 2^13691941 is an apocalyptic number.

It is an amenable number.

13691941 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691941 is an equidigital number, since it uses as much as digits as its factorization.

13691941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 13691941 is about 3700.2622880007. The cubic root of 13691941 is about 239.2333231447.

The spelling of 13691941 in words is "thirteen million, six hundred ninety-one thousand, nine hundred forty-one".