13067981 has 2 divisors, whose sum is σ = 13067982. Its totient is φ = 13067980.

The previous prime is 13067963. The next prime is 13067983. The reversal of 13067981 is 18976031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7474756 + 5593225 = 2734^2 + 2365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13067981 is a prime.

It is a super-2 number, since 2×13067981² = 341544254832722, which contains 22 as substring.

Together with 13067983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13067983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6533990 + 6533991.

It is an arithmetic number, because the mean of its divisors is an integer number (6533991).

Almost surely, 2^13067981 is an apocalyptic number.

It is an amenable number.

13067981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13067981 is an equidigital number, since it uses as much as digits as its factorization.

13067981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 13067981 is about 3614.9662515714. The cubic root of 13067981 is about 235.5426181617.

The spelling of 13067981 in words is "thirteen million, sixty-seven thousand, nine hundred eighty-one".