13328981 has 2 divisors, whose sum is σ = 13328982. Its totient is φ = 13328980.

The previous prime is 13328971. The next prime is 13328993. The reversal of 13328981 is 18982331.

13328981 is digitally balanced in base 2, 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., 13140625 + 188356 = 3625^2 + 434^2 .

It is an emirp because it is prime and its reverse (18982331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13328981 - 2¹⁰ = 13327957 is a prime.

It is a super-2 number, since 2×13328981² = 355323468996722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₈₆₉₂₄₆ and since 13328981 and 869246 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13328911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6664490 + 6664491.

It is an arithmetic number, because the mean of its divisors is an integer number (6664491).

Almost surely, 2^13328981 is an apocalyptic number.

It is an amenable number.

13328981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13328981 is an equidigital number, since it uses as much as digits as its factorization.

13328981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 13328981 is about 3650.8877002724. The cubic root of 13328981 is about 237.1004161826.

The spelling of 13328981 in words is "thirteen million, three hundred twenty-eight thousand, nine hundred eighty-one".