9991841129 has 4 divisors (see below), whose sum is σ = 9992238720. Its totient is φ = 9991443540.

The previous prime is 9991841117. The next prime is 9991841173. The reversal of 9991841129 is 9211481999.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9211481999 = 3469 ⋅2655371.

It is a cyclic number.

It is not a de Polignac number, because 9991841129 - 2⁴ = 9991841113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991841929) 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, 158357 + ... + 212274.

It is an arithmetic number, because the mean of its divisors is an integer number (2498059680).

Almost surely, 2^9991841129 is an apocalyptic number.

It is an amenable number.

9991841129 is a deficient number, since it is larger than the sum of its proper divisors (397591).

9991841129 is a wasteful number, since it uses less digits than its factorization.

9991841129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397590.

The product of its digits is 419904, while the sum is 53.

The square root of 9991841129 is about 99959.1973207068. The cubic root of 9991841129 is about 2153.8486054529.

The spelling of 9991841129 in words is "nine billion, nine hundred ninety-one million, eight hundred forty-one thousand, one hundred twenty-nine".