338063981 has 2 divisors, whose sum is σ = 338063982. Its totient is φ = 338063980.

The previous prime is 338063939. The next prime is 338063993. The reversal of 338063981 is 189360833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197262025 + 140801956 = 14045^2 + 11866^2 .

It is an emirp because it is prime and its reverse (189360833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 338063981 - 2⁶ = 338063917 is a prime.

It is a super-2 number, since 2×338063981² = 228574510499136722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338063911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169031990 + 169031991.

It is an arithmetic number, because the mean of its divisors is an integer number (169031991).

Almost surely, 2^338063981 is an apocalyptic number.

It is an amenable number.

338063981 is a deficient number, since it is larger than the sum of its proper divisors (1).

338063981 is an equidigital number, since it uses as much as digits as its factorization.

338063981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 338063981 is about 18386.5162823195. The cubic root of 338063981 is about 696.6259266893.

The spelling of 338063981 in words is "three hundred thirty-eight million, sixty-three thousand, nine hundred eighty-one".