6891735139 has 2 divisors, whose sum is σ = 6891735140. Its totient is φ = 6891735138.

The previous prime is 6891735127. The next prime is 6891735211. The reversal of 6891735139 is 9315371986.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6891735139 - 2¹⁷ = 6891604067 is a prime.

It is a super-2 number, since 2×6891735139² = 94992026452254698642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6891735839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445867569 + 3445867570.

It is an arithmetic number, because the mean of its divisors is an integer number (3445867570).

Almost surely, 2^6891735139 is an apocalyptic number.

6891735139 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891735139 is an equidigital number, since it uses as much as digits as its factorization.

6891735139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 6891735139 is about 83016.4751058487. The cubic root of 6891735139 is about 1903.0178392980.

The spelling of 6891735139 in words is "six billion, eight hundred ninety-one million, seven hundred thirty-five thousand, one hundred thirty-nine".