13722217 has 2 divisors, whose sum is σ = 13722218. Its totient is φ = 13722216.

The previous prime is 13722209. The next prime is 13722229. The reversal of 13722217 is 71222731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 2601 = 3704^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 13722217 - 2³ = 13722209 is a prime.

It is equal to p₈₉₃₂₀₃ and since 13722217 and 893203 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 13722191 and 13722200.

It is not a weakly prime, because it can be changed into another prime (13722277) 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, 6861108 + 6861109.

It is an arithmetic number, because the mean of its divisors is an integer number (6861109).

Almost surely, 2^13722217 is an apocalyptic number.

It is an amenable number.

13722217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13722217 is an equidigital number, since it uses as much as digits as its factorization.

13722217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 25.

The square root of 13722217 is about 3704.3510902721. The cubic root of 13722217 is about 239.4095264548.

Adding to 13722217 its reverse (71222731), we get a palindrome (84944948).

The spelling of 13722217 in words is "thirteen million, seven hundred twenty-two thousand, two hundred seventeen".