13722281 has 4 divisors (see below), whose sum is σ = 14529492. Its totient is φ = 12915072.

The previous prime is 13722277. The next prime is 13722311. The reversal of 13722281 is 18222731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4818025 + 8904256 = 2195^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 13722281 - 2² = 13722277 is a prime.

It is a super-2 number, since 2×13722281² = 376601991685922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13722281.

It is not an unprimeable number, because it can be changed into a prime (13722581) 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 in 3 ways as a sum of consecutive naturals, for example, 403580 + ... + 403613.

It is an arithmetic number, because the mean of its divisors is an integer number (3632373).

Almost surely, 2^13722281 is an apocalyptic number.

It is an amenable number.

13722281 is a deficient number, since it is larger than the sum of its proper divisors (807211).

13722281 is an equidigital number, since it uses as much as digits as its factorization.

13722281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807210.

The product of its digits is 1344, while the sum is 26.

The square root of 13722281 is about 3704.3597287521. The cubic root of 13722281 is about 239.4098986538.

The spelling of 13722281 in words is "thirteen million, seven hundred twenty-two thousand, two hundred eighty-one".