13222981 has 2 divisors, whose sum is σ = 13222982. Its totient is φ = 13222980.

The previous prime is 13222967. The next prime is 13223003. The reversal of 13222981 is 18922231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 1285956 = 3455^2 + 1134^2 .

It is an emirp because it is prime and its reverse (18922231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13222981 is a prime.

It is a super-2 number, since 2×13222981² = 349694453052722, which contains 22 as substring.

It is equal to p₈₆₂₈₁₃ and since 13222981 and 862813 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 (13222901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6611490 + 6611491.

It is an arithmetic number, because the mean of its divisors is an integer number (6611491).

Almost surely, 2^13222981 is an apocalyptic number.

It is an amenable number.

13222981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13222981 is an equidigital number, since it uses as much as digits as its factorization.

13222981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 13222981 is about 3636.3417056157. The cubic root of 13222981 is about 236.4702213891.

The spelling of 13222981 in words is "thirteen million, two hundred twenty-two thousand, nine hundred eighty-one".