989794909497989 has 4 divisors (see below), whose sum is σ = 1131194182283424. Its totient is φ = 848395636712556.

The previous prime is 989794909497971. The next prime is 989794909498037.

989794909497989 is nontrivially palindromic in base 10.

989794909497989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989794909497989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989794909497989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989794909497929) 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, 70699636392707 + ... + 70699636392720.

It is an arithmetic number, because the mean of its divisors is an integer number (282798545570856).

Almost surely, 2^{989794909497989} is an apocalyptic number.

It is an amenable number.

989794909497989 is a deficient number, since it is larger than the sum of its proper divisors (141399272785435).

989794909497989 is a wasteful number, since it uses less digits than its factorization.

989794909497989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141399272785434.

The product of its (nonzero) digits is 2159912272896, while the sum is 110.

The spelling of 989794909497989 in words is "nine hundred eighty-nine trillion, seven hundred ninety-four billion, nine hundred nine million, four hundred ninety-seven thousand, nine hundred eighty-nine".