6989116861 has 2 divisors, whose sum is σ = 6989116862. Its totient is φ = 6989116860.

The previous prime is 6989116831. The next prime is 6989116903. The reversal of 6989116861 is 1686119896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6617822500 + 371294361 = 81350^2 + 19269^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989116861 - 2⁹ = 6989116349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6989116801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494558430 + 3494558431.

It is an arithmetic number, because the mean of its divisors is an integer number (3494558431).

Almost surely, 2^6989116861 is an apocalyptic number.

It is an amenable number.

6989116861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989116861 is an equidigital number, since it uses as much as digits as its factorization.

6989116861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 55.

The square root of 6989116861 is about 83600.9381586116. The cubic root of 6989116861 is about 1911.9393020835.

The spelling of 6989116861 in words is "six billion, nine hundred eighty-nine million, one hundred sixteen thousand, eight hundred sixty-one".