338566981 has 2 divisors, whose sum is σ = 338566982. Its totient is φ = 338566980.

The previous prime is 338566961. The next prime is 338567003. The reversal of 338566981 is 189665833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302446881 + 36120100 = 17391^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 338566981 - 2²⁵ = 305012549 is a prime.

It is a super-2 number, since 2×338566981² = 229255201246908722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338566901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169283490 + 169283491.

It is an arithmetic number, because the mean of its divisors is an integer number (169283491).

Almost surely, 2^338566981 is an apocalyptic number.

It is an amenable number.

338566981 is a deficient number, since it is larger than the sum of its proper divisors (1).

338566981 is an equidigital number, since it uses as much as digits as its factorization.

338566981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 49.

The square root of 338566981 is about 18400.1897001091. The cubic root of 338566981 is about 696.9712550078.

The spelling of 338566981 in words is "three hundred thirty-eight million, five hundred sixty-six thousand, nine hundred eighty-one".