13691819 has 2 divisors, whose sum is σ = 13691820. Its totient is φ = 13691818.

The previous prime is 13691809. The next prime is 13691869. The reversal of 13691819 is 91819631.

It is a weak prime.

It is an emirp because it is prime and its reverse (91819631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13691819 - 2⁴ = 13691803 is a prime.

It is a super-2 number, since 2×13691819² = 374931815057522, which contains 22 as substring.

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, 6845909 + 6845910.

It is an arithmetic number, because the mean of its divisors is an integer number (6845910).

Almost surely, 2^13691819 is an apocalyptic number.

13691819 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691819 is an equidigital number, since it uses as much as digits as its factorization.

13691819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The square root of 13691819 is about 3700.2458026461. The cubic root of 13691819 is about 239.2326125916.

The spelling of 13691819 in words is "thirteen million, six hundred ninety-one thousand, eight hundred nineteen".