13505281 has 2 divisors, whose sum is σ = 13505282. Its totient is φ = 13505280.

The previous prime is 13505267. The next prime is 13505291. The reversal of 13505281 is 18250531.

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., 8904256 + 4601025 = 2984^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 13505281 - 2⁷ = 13505153 is a prime.

It is a super-2 number, since 2×13505281² = 364785229777922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13505201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6752640 + 6752641.

It is an arithmetic number, because the mean of its divisors is an integer number (6752641).

Almost surely, 2^13505281 is an apocalyptic number.

It is an amenable number.

13505281 is a deficient number, since it is larger than the sum of its proper divisors (1).

13505281 is an equidigital number, since it uses as much as digits as its factorization.

13505281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 13505281 is about 3674.9531969809. The cubic root of 13505281 is about 238.1412021363.

The spelling of 13505281 in words is "thirteen million, five hundred five thousand, two hundred eighty-one".