989771177989 has 4 divisors (see below), whose sum is σ = 1079750376000. Its totient is φ = 899791979980.

The previous prime is 989771177987. The next prime is 989771178041.

989771177989 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 989771177989 - 2¹ = 989771177987 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 (989771177981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44989598989 + ... + 44989599010.

It is an arithmetic number, because the mean of its divisors is an integer number (269937594000).

Almost surely, 2^989771177989 is an apocalyptic number.

It is an amenable number.

989771177989 is a deficient number, since it is larger than the sum of its proper divisors (89979198011).

989771177989 is a wasteful number, since it uses less digits than its factorization.

989771177989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89979198010.

The product of its digits is 1008189504, while the sum is 82.

The spelling of 989771177989 in words is "nine hundred eighty-nine billion, seven hundred seventy-one million, one hundred seventy-seven thousand, nine hundred eighty-nine".