9965681 has 6 divisors (see below), whose sum is σ = 10954146. Its totient is φ = 9059600.

The previous prime is 9965651. The next prime is 9965687. The reversal of 9965681 is 1865699.

It can be written as a sum of positive squares in only one way, i.e., 8755681 + 1210000 = 2959^2 + 1100^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9965681 is a prime.

It is a super-2 number, since 2×9965681² = 198629595587522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9965687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41060 + ... + 41301.

It is an arithmetic number, because the mean of its divisors is an integer number (1825691).

Almost surely, 2^9965681 is an apocalyptic number.

It is an amenable number.

9965681 is a deficient number, since it is larger than the sum of its proper divisors (988465).

9965681 is a wasteful number, since it uses less digits than its factorization.

9965681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82383 (or 82372 counting only the distinct ones).

The product of its digits is 116640, while the sum is 44.

The square root of 9965681 is about 3156.8466861728. The cubic root of 9965681 is about 215.1967263751.

The spelling of 9965681 in words is "nine million, nine hundred sixty-five thousand, six hundred eighty-one".