13691869 has 2 divisors, whose sum is σ = 13691870. Its totient is φ = 13691868.

The previous prime is 13691819. The next prime is 13691879. The reversal of 13691869 is 96819631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11471769 + 2220100 = 3387^2 + 1490^2 .

It is an emirp because it is prime and its reverse (96819631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13691869 - 2¹¹ = 13689821 is a prime.

It is a super-2 number, since 2×13691869² = 374934553426322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13691809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6845934 + 6845935.

It is an arithmetic number, because the mean of its divisors is an integer number (6845935).

Almost surely, 2^13691869 is an apocalyptic number.

It is an amenable number.

13691869 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691869 is an equidigital number, since it uses as much as digits as its factorization.

13691869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 13691869 is about 3700.2525589478. The cubic root of 13691869 is about 239.2329038024.

The spelling of 13691869 in words is "thirteen million, six hundred ninety-one thousand, eight hundred sixty-nine".