1338967681 has 2 divisors, whose sum is σ = 1338967682. Its totient is φ = 1338967680.

The previous prime is 1338967661. The next prime is 1338967691. The reversal of 1338967681 is 1867698331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1237280625 + 101687056 = 35175^2 + 10084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338967681 - 2⁵ = 1338967649 is a prime.

It is a super-2 number, since 2×1338967681² = 3585668901525035522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1338967661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669483840 + 669483841.

It is an arithmetic number, because the mean of its divisors is an integer number (669483841).

Almost surely, 2^1338967681 is an apocalyptic number.

It is an amenable number.

1338967681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338967681 is an equidigital number, since it uses as much as digits as its factorization.

1338967681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 1338967681 is about 36591.9073156894. The cubic root of 1338967681 is about 1102.1905881147.

The spelling of 1338967681 in words is "one billion, three hundred thirty-eight million, nine hundred sixty-seven thousand, six hundred eighty-one".