13722209 has 2 divisors, whose sum is σ = 13722210. Its totient is φ = 13722208.

The previous prime is 13722197. The next prime is 13722217. The reversal of 13722209 is 90222731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 10000 = 3703^2 + 100^2 .

It is an emirp because it is prime and its reverse (90222731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13722209 - 2¹⁶ = 13656673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13722229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6861104 + 6861105.

It is an arithmetic number, because the mean of its divisors is an integer number (6861105).

Almost surely, 2^13722209 is an apocalyptic number.

It is an amenable number.

13722209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13722209 is an equidigital number, since it uses as much as digits as its factorization.

13722209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 13722209 is about 3704.3500104607. The cubic root of 13722209 is about 239.4094799298.

It can be divided in two parts, 13722 and 209, that added together give a palindrome (13931).

The spelling of 13722209 in words is "thirteen million, seven hundred twenty-two thousand, two hundred nine".