6438939061 has 2 divisors, whose sum is σ = 6438939062. Its totient is φ = 6438939060.

The previous prime is 6438939043. The next prime is 6438939113. The reversal of 6438939061 is 1609398346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6335204836 + 103734225 = 79594^2 + 10185^2 .

It is a cyclic number.

It is not a de Polignac number, because 6438939061 - 2⁵ = 6438939029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6438938996 and 6438939014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6438939011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219469530 + 3219469531.

It is an arithmetic number, because the mean of its divisors is an integer number (3219469531).

Almost surely, 2^6438939061 is an apocalyptic number.

It is an amenable number.

6438939061 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438939061 is an equidigital number, since it uses as much as digits as its factorization.

6438939061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 6438939061 is about 80243.0000747729. Note that the first 4 decimals coincide. The cubic root of 6438939061 is about 1860.3933207795.

The spelling of 6438939061 in words is "six billion, four hundred thirty-eight million, nine hundred thirty-nine thousand, sixty-one".