9651681 has 12 divisors (see below), whose sum is σ = 15013908. Its totient is φ = 5939424.

The previous prime is 9651679. The next prime is 9651683. The reversal of 9651681 is 1861569.

It is an interprime number because it is at equal distance from previous prime (9651679) and next prime (9651683).

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 8946081 = 840^2 + 2991^2 .

It is not a de Polignac number, because 9651681 - 2¹ = 9651679 is a prime.

It is a super-2 number, since 2×9651681² = 186309892251522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (9651683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41130 + ... + 41363.

It is an arithmetic number, because the mean of its divisors is an integer number (1251159).

Almost surely, 2^9651681 is an apocalyptic number.

It is an amenable number.

9651681 is a deficient number, since it is larger than the sum of its proper divisors (5362227).

9651681 is a wasteful number, since it uses less digits than its factorization.

9651681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82512 (or 82509 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 9651681 is about 3106.7154681432. The cubic root of 9651681 is about 212.9124152236.

The spelling of 9651681 in words is "nine million, six hundred fifty-one thousand, six hundred eighty-one".