13665481 has 2 divisors, whose sum is σ = 13665482. Its totient is φ = 13665480.

The previous prime is 13665413. The next prime is 13665493. The reversal of 13665481 is 18456631.

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., 13286025 + 379456 = 3645^2 + 616^2 .

It is an emirp because it is prime and its reverse (18456631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13665481 - 2⁹ = 13664969 is a prime.

It is a super-2 number, since 2×13665481² = 373490741922722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13668481) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832740 + 6832741.

It is an arithmetic number, because the mean of its divisors is an integer number (6832741).

Almost surely, 2^13665481 is an apocalyptic number.

It is an amenable number.

13665481 is a deficient number, since it is larger than the sum of its proper divisors (1).

13665481 is an equidigital number, since it uses as much as digits as its factorization.

13665481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 13665481 is about 3696.6851367137. The cubic root of 13665481 is about 239.0791157460.

The spelling of 13665481 in words is "thirteen million, six hundred sixty-five thousand, four hundred eighty-one".