6999999989 has 2 divisors, whose sum is σ = 6999999990. Its totient is φ = 6999999988.

The previous prime is 6999999907. The next prime is 7000000001. The reversal of 6999999989 is 9899999996.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4123823089 + 2876176900 = 64217^2 + 53630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6999999989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6999999989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6999399989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499999994 + 3499999995.

It is an arithmetic number, because the mean of its divisors is an integer number (3499999995).

Almost surely, 2^6999999989 is an apocalyptic number.

It is an amenable number.

6999999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6999999989 is an equidigital number, since it uses as much as digits as its factorization.

6999999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2066242608, while the sum is 86.

The square root of 6999999989 is about 83666.0025876700. The cubic root of 6999999989 is about 1912.9311817704.

It can be divided in two parts, 699999998 and 9, that added together give a palindrome (700000007).

The spelling of 6999999989 in words is "six billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".