13951999 has 2 divisors, whose sum is σ = 13952000. Its totient is φ = 13951998.

The previous prime is 13951991. The next prime is 13952009. The reversal of 13951999 is 99915931.

It is a weak prime.

It is an emirp because it is prime and its reverse (99915931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13951999 - 2³ = 13951991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13951991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6975999 + 6976000.

It is an arithmetic number, because the mean of its divisors is an integer number (6976000).

Almost surely, 2^13951999 is an apocalyptic number.

13951999 is a deficient number, since it is larger than the sum of its proper divisors (1).

13951999 is an equidigital number, since it uses as much as digits as its factorization.

13951999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98415, while the sum is 46.

The square root of 13951999 is about 3735.2374757169. The cubic root of 13951999 is about 240.7384604407.

The spelling of 13951999 in words is "thirteen million, nine hundred fifty-one thousand, nine hundred ninety-nine".