9959813 has 4 divisors (see below), whose sum is σ = 10147788. Its totient is φ = 9771840.

The previous prime is 9959801. The next prime is 9959827. The reversal of 9959813 is 3189599.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4190209 + 5769604 = 2047^2 + 2402^2 .

It is a cyclic number.

It is not a de Polignac number, because 9959813 - 2⁴ = 9959797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9959113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93908 + ... + 94013.

It is an arithmetic number, because the mean of its divisors is an integer number (2536947).

Almost surely, 2^9959813 is an apocalyptic number.

It is an amenable number.

9959813 is a deficient number, since it is larger than the sum of its proper divisors (187975).

9959813 is a wasteful number, since it uses less digits than its factorization.

9959813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187974.

The product of its digits is 87480, while the sum is 44.

The square root of 9959813 is about 3155.9171408641. The cubic root of 9959813 is about 215.1544806480.

The spelling of 9959813 in words is "nine million, nine hundred fifty-nine thousand, eight hundred thirteen".