13445281 has 2 divisors, whose sum is σ = 13445282. Its totient is φ = 13445280.

The previous prime is 13445279. The next prime is 13445297. The reversal of 13445281 is 18254431.

13445281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7728400 + 5716881 = 2780^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 13445281 - 2¹ = 13445279 is a prime.

It is a super-2 number, since 2×13445281² = 361551162337922, which contains 22 as substring.

Together with 13445279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13445231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6722640 + 6722641.

It is an arithmetic number, because the mean of its divisors is an integer number (6722641).

Almost surely, 2^13445281 is an apocalyptic number.

It is an amenable number.

13445281 is a deficient number, since it is larger than the sum of its proper divisors (1).

13445281 is an equidigital number, since it uses as much as digits as its factorization.

13445281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 13445281 is about 3666.7807406498. The cubic root of 13445281 is about 237.7880147587.

The spelling of 13445281 in words is "thirteen million, four hundred forty-five thousand, two hundred eighty-one".