9813681 has 6 divisors (see below), whose sum is σ = 14175330. Its totient is φ = 6542448.

The previous prime is 9813679. The next prime is 9813703. The reversal of 9813681 is 1863189.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 1742400 = 2841^2 + 1320^2 .

It is not a de Polignac number, because 9813681 - 2¹ = 9813679 is a prime.

It is a super-2 number, since 2×9813681² = 192616669539522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9813611) 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, 545196 + ... + 545213.

It is an arithmetic number, because the mean of its divisors is an integer number (2362555).

Almost surely, 2^9813681 is an apocalyptic number.

It is an amenable number.

9813681 is a deficient number, since it is larger than the sum of its proper divisors (4361649).

9813681 is a wasteful number, since it uses less digits than its factorization.

9813681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090415 (or 1090412 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 9813681 is about 3132.6795239858. The cubic root of 9813681 is about 214.0970314336.

The spelling of 9813681 in words is "nine million, eight hundred thirteen thousand, six hundred eighty-one".