13327781 has 2 divisors, whose sum is σ = 13327782. Its totient is φ = 13327780.

The previous prime is 13327777. The next prime is 13327793. The reversal of 13327781 is 18772331.

13327781 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., 11282881 + 2044900 = 3359^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 13327781 - 2² = 13327777 is a prime.

It is a super-2 number, since 2×13327781² = 355259492767922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13327081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6663890 + 6663891.

It is an arithmetic number, because the mean of its divisors is an integer number (6663891).

Almost surely, 2^13327781 is an apocalyptic number.

It is an amenable number.

13327781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13327781 is an equidigital number, since it uses as much as digits as its factorization.

13327781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 13327781 is about 3650.7233529809. The cubic root of 13327781 is about 237.0933006340.

The spelling of 13327781 in words is "thirteen million, three hundred twenty-seven thousand, seven hundred eighty-one".