13812991 has 2 divisors, whose sum is σ = 13812992. Its totient is φ = 13812990.

The previous prime is 13812989. The next prime is 13813013. The reversal of 13812991 is 19921831.

It is a weak prime.

It is an emirp because it is prime and its reverse (19921831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13812991 - 2¹ = 13812989 is a prime.

Together with 13812989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13812191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6906495 + 6906496.

It is an arithmetic number, because the mean of its divisors is an integer number (6906496).

Almost surely, 2^13812991 is an apocalyptic number.

13812991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13812991 is an equidigital number, since it uses as much as digits as its factorization.

13812991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 13812991 is about 3716.5832427110. The cubic root of 13812991 is about 239.9362735897.

The spelling of 13812991 in words is "thirteen million, eight hundred twelve thousand, nine hundred ninety-one".