13333981 has 2 divisors, whose sum is σ = 13333982. Its totient is φ = 13333980.

The previous prime is 13333973. The next prime is 13334011. The reversal of 13333981 is 18933331.

13333981 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., 7128900 + 6205081 = 2670^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 13333981 - 2³ = 13333973 is a prime.

It is a super-2 number, since 2×13333981² = 355590098616722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13333921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6666990 + 6666991.

It is an arithmetic number, because the mean of its divisors is an integer number (6666991).

Almost surely, 2^13333981 is an apocalyptic number.

It is an amenable number.

13333981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13333981 is an equidigital number, since it uses as much as digits as its factorization.

13333981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The square root of 13333981 is about 3651.5724010349. The cubic root of 13333981 is about 237.1300597059.

The spelling of 13333981 in words is "thirteen million, three hundred thirty-three thousand, nine hundred eighty-one".