9894791813 has 4 divisors (see below), whose sum is σ = 9895325568. Its totient is φ = 9894258060.

The previous prime is 9894791801. The next prime is 9894791827. The reversal of 9894791813 is 3181974989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9894791813 is a prime.

It is a super-2 number, since 2×9894791813² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9894721813) 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, 238031 + ... + 276492.

It is an arithmetic number, because the mean of its divisors is an integer number (2473831392).

Almost surely, 2^9894791813 is an apocalyptic number.

It is an amenable number.

9894791813 is a deficient number, since it is larger than the sum of its proper divisors (533755).

9894791813 is a wasteful number, since it uses less digits than its factorization.

9894791813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533754.

The product of its digits is 3919104, while the sum is 59.

The square root of 9894791813 is about 99472.5681431821. The cubic root of 9894791813 is about 2146.8525652244.

The spelling of 9894791813 in words is "nine billion, eight hundred ninety-four million, seven hundred ninety-one thousand, eight hundred thirteen".