8991896120929 has 4 divisors (see below), whose sum is σ = 9520831186884. Its totient is φ = 8462961054976.

The previous prime is 8991896120903. The next prime is 8991896120993. The reversal of 8991896120929 is 9290216981998.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8023537782225 + 968358338704 = 2832585^2 + 984052^2 .

It is not a de Polignac number, because 8991896120929 - 2¹⁹ = 8991895596641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991896129929) 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, 264467532952 + ... + 264467532985.

It is an arithmetic number, because the mean of its divisors is an integer number (2380207796721).

Almost surely, 2^{8991896120929} is an apocalyptic number.

It is an amenable number.

8991896120929 is a deficient number, since it is larger than the sum of its proper divisors (528935065955).

8991896120929 is a wasteful number, since it uses less digits than its factorization.

8991896120929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528935065954.

The product of its (nonzero) digits is 90699264, while the sum is 73.

The spelling of 8991896120929 in words is "eight trillion, nine hundred ninety-one billion, eight hundred ninety-six million, one hundred twenty thousand, nine hundred twenty-nine".