9987643211 has 32 divisors (see below), whose sum is σ = 13173715968. Its totient is φ = 7354385280.

The previous prime is 9987643163. The next prime is 9987643219. The reversal of 9987643211 is 1123467899.

It is a cyclic number.

It is not a de Polignac number, because 9987643211 - 2¹⁸ = 9987381067 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9987643211.

It is not an unprimeable number, because it can be changed into a prime (9987643219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12956 + ... + 141926.

It is an arithmetic number, because the mean of its divisors is an integer number (411678624).

Almost surely, 2^9987643211 is an apocalyptic number.

9987643211 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9987643211 is a deficient number, since it is larger than the sum of its proper divisors (3186072757).

9987643211 is a wasteful number, since it uses less digits than its factorization.

9987643211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129051.

The product of its digits is 653184, while the sum is 50.

The square root of 9987643211 is about 99938.1969569193. The cubic root of 9987643211 is about 2153.5469277724.

The spelling of 9987643211 in words is "nine billion, nine hundred eighty-seven million, six hundred forty-three thousand, two hundred eleven".