8689520989 has 2 divisors, whose sum is σ = 8689520990. Its totient is φ = 8689520988.

The previous prime is 8689520977. The next prime is 8689521007. The reversal of 8689520989 is 9890259868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5543993764 + 3145527225 = 74458^2 + 56085^2 .

It is a cyclic number.

It is not a de Polignac number, because 8689520989 - 2²¹ = 8687423837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8689520989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8689521989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4344760494 + 4344760495.

It is an arithmetic number, because the mean of its divisors is an integer number (4344760495).

Almost surely, 2^8689520989 is an apocalyptic number.

It is an amenable number.

8689520989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8689520989 is an equidigital number, since it uses as much as digits as its factorization.

8689520989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22394880, while the sum is 64.

The square root of 8689520989 is about 93217.6002104753. The cubic root of 8689520989 is about 2055.8840262881.

The spelling of 8689520989 in words is "eight billion, six hundred eighty-nine million, five hundred twenty thousand, nine hundred eighty-nine".