9894721841 has 8 divisors (see below), whose sum is σ = 9941921760. Its totient is φ = 9847554048.

The previous prime is 9894721813. The next prime is 9894721847. The reversal of 9894721841 is 1481274989.

9894721841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9894721841 - 2³⁰ = 8820980017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9894721847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 799025 + ... + 811313.

It is an arithmetic number, because the mean of its divisors is an integer number (1242740220).

Almost surely, 2^9894721841 is an apocalyptic number.

It is an amenable number.

9894721841 is a deficient number, since it is larger than the sum of its proper divisors (47199919).

9894721841 is a wasteful number, since it uses less digits than its factorization.

9894721841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16063.

The product of its digits is 1161216, while the sum is 53.

The square root of 9894721841 is about 99472.2164275030. The cubic root of 9894721841 is about 2146.8475046524.

The spelling of 9894721841 in words is "nine billion, eight hundred ninety-four million, seven hundred twenty-one thousand, eight hundred forty-one".