9631681 has 2 divisors, whose sum is σ = 9631682. Its totient is φ = 9631680.

The previous prime is 9631667. The next prime is 9631697. The reversal of 9631681 is 1861369.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9054081 + 577600 = 3009^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 9631681 - 2⁵ = 9631649 is a prime.

It is a super-2 number, since 2×9631681² = 185538557771522, which contains 22 as substring.

9631681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9631621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4815840 + 4815841.

It is an arithmetic number, because the mean of its divisors is an integer number (4815841).

Almost surely, 2^9631681 is an apocalyptic number.

It is an amenable number.

9631681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9631681 is an equidigital number, since it uses as much as digits as its factorization.

9631681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 9631681 is about 3103.4949653576. The cubic root of 9631681 is about 212.7652493922.

The spelling of 9631681 in words is "nine million, six hundred thirty-one thousand, six hundred eighty-one".