9821871157 has 16 divisors (see below), whose sum is σ = 11409203200. Its totient is φ = 8281381680.

The previous prime is 9821871131. The next prime is 9821871161. The reversal of 9821871157 is 7511781289.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9821871157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9821871157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9821821157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117094 + ... + 182632.

It is an arithmetic number, because the mean of its divisors is an integer number (713075200).

Almost surely, 2^9821871157 is an apocalyptic number.

It is an amenable number.

9821871157 is a deficient number, since it is larger than the sum of its proper divisors (1587332043).

9821871157 is a wasteful number, since it uses less digits than its factorization.

9821871157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65896.

The product of its digits is 282240, while the sum is 49.

The square root of 9821871157 is about 99105.3538261178. The cubic root of 9821871157 is about 2141.5657418571.

The spelling of 9821871157 in words is "nine billion, eight hundred twenty-one million, eight hundred seventy-one thousand, one hundred fifty-seven".