9984690871 has 4 divisors (see below), whose sum is σ = 9997219512. Its totient is φ = 9972162232.

The previous prime is 9984690853. The next prime is 9984690889. The reversal of 9984690871 is 1780964899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1780964899 = 7 ⋅254423557.

It is an interprime number because it is at equal distance from previous prime (9984690853) and next prime (9984690889).

It is a cyclic number.

It is not a de Polignac number, because 9984690871 - 2⁷ = 9984690743 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 (9984690071) 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, 6263125 + ... + 6264718.

It is an arithmetic number, because the mean of its divisors is an integer number (2499304878).

Almost surely, 2^9984690871 is an apocalyptic number.

9984690871 is a deficient number, since it is larger than the sum of its proper divisors (12528641).

9984690871 is a wasteful number, since it uses less digits than its factorization.

9984690871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12528640.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The square root of 9984690871 is about 99923.4250363747. The cubic root of 9984690871 is about 2153.3347112305.

The spelling of 9984690871 in words is "nine billion, nine hundred eighty-four million, six hundred ninety thousand, eight hundred seventy-one".