13812191 has 2 divisors, whose sum is σ = 13812192. Its totient is φ = 13812190.

The previous prime is 13812187. The next prime is 13812193. The reversal of 13812191 is 19121831.

It is a strong prime.

It is an emirp because it is prime and its reverse (19121831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13812191 - 2² = 13812187 is a prime.

It is a Sophie Germain prime.

Together with 13812193, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13812191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13812193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6906095 + 6906096.

It is an arithmetic number, because the mean of its divisors is an integer number (6906096).

Almost surely, 2^13812191 is an apocalyptic number.

13812191 is a deficient number, since it is larger than the sum of its proper divisors (1).

13812191 is an equidigital number, since it uses as much as digits as its factorization.

13812191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 13812191 is about 3716.4756154185. The cubic root of 13812191 is about 239.9316414111.

The spelling of 13812191 in words is "thirteen million, eight hundred twelve thousand, one hundred ninety-one".