13718321 has 2 divisors, whose sum is σ = 13718322. Its totient is φ = 13718320.

The previous prime is 13718293. The next prime is 13718329. The reversal of 13718321 is 12381731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10962721 + 2755600 = 3311^2 + 1660^2 .

It is an emirp because it is prime and its reverse (12381731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13718321 - 2¹⁴ = 13701937 is a prime.

It is not a weakly prime, because it can be changed into another prime (13718329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6859160 + 6859161.

It is an arithmetic number, because the mean of its divisors is an integer number (6859161).

Almost surely, 2^13718321 is an apocalyptic number.

It is an amenable number.

13718321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13718321 is an equidigital number, since it uses as much as digits as its factorization.

13718321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 13718321 is about 3703.8251848596. The cubic root of 13718321 is about 239.3868666615.

The spelling of 13718321 in words is "thirteen million, seven hundred eighteen thousand, three hundred twenty-one".