13721369 has 2 divisors, whose sum is σ = 13721370. Its totient is φ = 13721368.

The previous prime is 13721353. The next prime is 13721371. The reversal of 13721369 is 96312731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 1471369 = 3500^2 + 1213^2 .

It is a cyclic number.

It is not a de Polignac number, because 13721369 - 2⁴ = 13721353 is a prime.

It is a super-2 number, since 2×13721369² = 376551934468322, which contains 22 as substring.

Together with 13721371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13721269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6860684 + 6860685.

It is an arithmetic number, because the mean of its divisors is an integer number (6860685).

Almost surely, 2^13721369 is an apocalyptic number.

It is an amenable number.

13721369 is a deficient number, since it is larger than the sum of its proper divisors (1).

13721369 is an equidigital number, since it uses as much as digits as its factorization.

13721369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 32.

The square root of 13721369 is about 3704.2366285107. The cubic root of 13721369 is about 239.4045947089.

The spelling of 13721369 in words is "thirteen million, seven hundred twenty-one thousand, three hundred sixty-nine".