9631628681 has 4 divisors (see below), whose sum is σ = 10198195092. Its totient is φ = 9065062272.

The previous prime is 9631628663. The next prime is 9631628701. The reversal of 9631628681 is 1868261369.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6575750281 + 3055878400 = 81091^2 + 55280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9631628681 is a prime.

It is a super-2 number, since 2×9631628681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9631628381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283283180 + ... + 283283213.

It is an arithmetic number, because the mean of its divisors is an integer number (2549548773).

Almost surely, 2^9631628681 is an apocalyptic number.

It is an amenable number.

9631628681 is a deficient number, since it is larger than the sum of its proper divisors (566566411).

9631628681 is a wasteful number, since it uses less digits than its factorization.

9631628681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566566410.

The product of its digits is 746496, while the sum is 50.

The square root of 9631628681 is about 98140.8614237719. The cubic root of 9631628681 is about 2127.6486414668.

The spelling of 9631628681 in words is "nine billion, six hundred thirty-one million, six hundred twenty-eight thousand, six hundred eighty-one".