9816813 has 6 divisors (see below), whose sum is σ = 14179854. Its totient is φ = 6544536.

The previous prime is 9816811. The next prime is 9816823. The reversal of 9816813 is 3186189.

It can be written as a sum of positive squares in only one way, i.e., 9715689 + 101124 = 3117^2 + 318^2 .

It is not a de Polignac number, because 9816813 - 2¹ = 9816811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9816811) 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, 545370 + ... + 545387.

It is an arithmetic number, because the mean of its divisors is an integer number (2363309).

Almost surely, 2^9816813 is an apocalyptic number.

It is an amenable number.

9816813 is a deficient number, since it is larger than the sum of its proper divisors (4363041).

9816813 is a wasteful number, since it uses less digits than its factorization.

9816813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090763 (or 1090760 counting only the distinct ones).

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

The square root of 9816813 is about 3133.1793756502. The cubic root of 9816813 is about 214.1198051030.

The spelling of 9816813 in words is "nine million, eight hundred sixteen thousand, eight hundred thirteen".