6938639969 has 2 divisors, whose sum is σ = 6938639970. Its totient is φ = 6938639968.

The previous prime is 6938639899. The next prime is 6938639993. The reversal of 6938639969 is 9699368396.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6874399744 + 64240225 = 82912^2 + 8015^2 .

It is a cyclic number.

It is not a de Polignac number, because 6938639969 - 2⁸ = 6938639713 is a prime.

It is a super-2 number, since 2×6938639969² = 96289449238808641922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6938639899 and 6938639908.

It is not a weakly prime, because it can be changed into another prime (6938639069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3469319984 + 3469319985.

It is an arithmetic number, because the mean of its divisors is an integer number (3469319985).

Almost surely, 2^6938639969 is an apocalyptic number.

It is an amenable number.

6938639969 is a deficient number, since it is larger than the sum of its proper divisors (1).

6938639969 is an equidigital number, since it uses as much as digits as its factorization.

6938639969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102036672, while the sum is 68.

The square root of 6938639969 is about 83298.4992001657. The cubic root of 6938639969 is about 1907.3253654967.

The spelling of 6938639969 in words is "six billion, nine hundred thirty-eight million, six hundred thirty-nine thousand, nine hundred sixty-nine".