6987111689 has 2 divisors, whose sum is σ = 6987111690. Its totient is φ = 6987111688.

The previous prime is 6987111671. The next prime is 6987111701. The reversal of 6987111689 is 9861117896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6916417225 + 70694464 = 83165^2 + 8408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6987111689 is a prime.

It is not a weakly prime, because it can be changed into another prime (6987111589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3493555844 + 3493555845.

It is an arithmetic number, because the mean of its divisors is an integer number (3493555845).

Almost surely, 2^6987111689 is an apocalyptic number.

It is an amenable number.

6987111689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6987111689 is an equidigital number, since it uses as much as digits as its factorization.

6987111689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 56.

The square root of 6987111689 is about 83588.9447774046. The cubic root of 6987111689 is about 1911.7564399792.

The spelling of 6987111689 in words is "six billion, nine hundred eighty-seven million, one hundred eleven thousand, six hundred eighty-nine".