13338581 has 2 divisors, whose sum is σ = 13338582. Its totient is φ = 13338580.

The previous prime is 13338547. The next prime is 13338583. The reversal of 13338581 is 18583331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 4036081 = 3050^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 13338581 - 2²² = 9144277 is a prime.

It is a super-2 number, since 2×13338581² = 355835486187122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 13338583, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13338583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6669290 + 6669291.

It is an arithmetic number, because the mean of its divisors is an integer number (6669291).

Almost surely, 2^13338581 is an apocalyptic number.

It is an amenable number.

13338581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13338581 is an equidigital number, since it uses as much as digits as its factorization.

13338581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 13338581 is about 3652.2022123645. The cubic root of 13338581 is about 237.1573252030.

The spelling of 13338581 in words is "thirteen million, three hundred thirty-eight thousand, five hundred eighty-one".