6871321517 has 2 divisors, whose sum is σ = 6871321518. Its totient is φ = 6871321516.

The previous prime is 6871321493. The next prime is 6871321573. The reversal of 6871321517 is 7151231786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6149539561 + 721781956 = 78419^2 + 26866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6871321517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6871321577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3435660758 + 3435660759.

It is an arithmetic number, because the mean of its divisors is an integer number (3435660759).

Almost surely, 2^6871321517 is an apocalyptic number.

It is an amenable number.

6871321517 is a deficient number, since it is larger than the sum of its proper divisors (1).

6871321517 is an equidigital number, since it uses as much as digits as its factorization.

6871321517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 6871321517 is about 82893.4347038413. The cubic root of 6871321517 is about 1901.1370402793.

The spelling of 6871321517 in words is "six billion, eight hundred seventy-one million, three hundred twenty-one thousand, five hundred seventeen".