9656289981 has 24 divisors (see below), whose sum is σ = 15043206360. Its totient is φ = 5933506176.

The previous prime is 9656289971. The next prime is 9656289997. The reversal of 9656289981 is 1899826569.

It can be written as a sum of positive squares in 4 ways, for example, as 2615401881 + 7040888100 = 51141^2 + 83910^2 .

It is not a de Polignac number, because 9656289981 - 2⁵ = 9656289949 is a prime.

It is a super-2 number, since 2×9656289981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9656289911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18255 + ... + 140163.

It is an arithmetic number, because the mean of its divisors is an integer number (626800265).

Almost surely, 2^9656289981 is an apocalyptic number.

It is an amenable number.

9656289981 is a deficient number, since it is larger than the sum of its proper divisors (5386916379).

9656289981 is a wasteful number, since it uses less digits than its factorization.

9656289981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122605 (or 122602 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The square root of 9656289981 is about 98266.4234670215. The cubic root of 9656289981 is about 2129.4630062024.

The spelling of 9656289981 in words is "nine billion, six hundred fifty-six million, two hundred eighty-nine thousand, nine hundred eighty-one".