9815913 has 24 divisors (see below), whose sum is σ = 15069600. Its totient is φ = 6139584.

The previous prime is 9815909. The next prime is 9815941. The reversal of 9815913 is 3195189.

It is a happy number.

It is not a de Polignac number, because 9815913 - 2² = 9815909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9815213) 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 in 23 ways as a sum of consecutive naturals, for example, 23218 + ... + 23636.

It is an arithmetic number, because the mean of its divisors is an integer number (627900).

Almost surely, 2^9815913 is an apocalyptic number.

It is an amenable number.

9815913 is a deficient number, since it is larger than the sum of its proper divisors (5253687).

9815913 is a wasteful number, since it uses less digits than its factorization.

9815913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 578 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 9815913 is about 3133.0357482799. The cubic root of 9815913 is about 214.1132614411.

The spelling of 9815913 in words is "nine million, eight hundred fifteen thousand, nine hundred thirteen".