6931200139 has 2 divisors, whose sum is σ = 6931200140. Its totient is φ = 6931200138.

The previous prime is 6931200113. The next prime is 6931200149. The reversal of 6931200139 is 9310021396.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6931200139 - 2¹¹ = 6931198091 is a prime.

It is not a weakly prime, because it can be changed into another prime (6931200109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3465600069 + 3465600070.

It is an arithmetic number, because the mean of its divisors is an integer number (3465600070).

Almost surely, 2^6931200139 is an apocalyptic number.

6931200139 is a deficient number, since it is larger than the sum of its proper divisors (1).

6931200139 is an equidigital number, since it uses as much as digits as its factorization.

6931200139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 6931200139 is about 83253.8295755817. The cubic root of 6931200139 is about 1906.6434234409.

The spelling of 6931200139 in words is "six billion, nine hundred thirty-one million, two hundred thousand, one hundred thirty-nine".