13721441 has 2 divisors, whose sum is σ = 13721442. Its totient is φ = 13721440.

The previous prime is 13721423. The next prime is 13721443. The reversal of 13721441 is 14412731.

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., 7980625 + 5740816 = 2825^2 + 2396^2 .

It is an emirp because it is prime and its reverse (14412731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13721441 - 2⁶ = 13721377 is a prime.

Together with 13721443, 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 (13721443) 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, 6860720 + 6860721.

It is an arithmetic number, because the mean of its divisors is an integer number (6860721).

Almost surely, 2^13721441 is an apocalyptic number.

It is an amenable number.

13721441 is a deficient number, since it is larger than the sum of its proper divisors (1).

13721441 is an equidigital number, since it uses as much as digits as its factorization.

13721441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 13721441 is about 3704.2463470995. The cubic root of 13721441 is about 239.4050134500.

The spelling of 13721441 in words is "thirteen million, seven hundred twenty-one thousand, four hundred forty-one".