989121242121989 has 4 divisors (see below), whose sum is σ = 996237222281280. Its totient is φ = 982005261962700.

The previous prime is 989121242121973. The next prime is 989121242122001.

989121242121989 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 989121242121989 - 2⁴ = 989121242121973 is a prime.

It is a super-2 number, since 2×989121242121989² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989121242124989) 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, 3557990079437 + ... + 3557990079714.

It is an arithmetic number, because the mean of its divisors is an integer number (249059305570320).

Almost surely, 2^{989121242121989} is an apocalyptic number.

It is an amenable number.

989121242121989 is a deficient number, since it is larger than the sum of its proper divisors (7115980159291).

989121242121989 is a wasteful number, since it uses less digits than its factorization.

989121242121989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7115980159290.

The product of its digits is 26873856, while the sum is 68.

The spelling of 989121242121989 in words is "nine hundred eighty-nine trillion, one hundred twenty-one billion, two hundred forty-two million, one hundred twenty-one thousand, nine hundred eighty-nine".