989181989 has 4 divisors (see below), whose sum is σ = 1001703360. Its totient is φ = 976660620.

The previous prime is 989181979. The next prime is 989181997.

989181989 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 989181989 - 2⁸ = 989181733 is a prime.

It is a super-2 number, since 2×989181989² = 1956962014723992242, which 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 (989181929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6260567 + ... + 6260724.

It is an arithmetic number, because the mean of its divisors is an integer number (250425840).

Almost surely, 2^989181989 is an apocalyptic number.

It is an amenable number.

989181989 is a deficient number, since it is larger than the sum of its proper divisors (12521371).

989181989 is a wasteful number, since it uses less digits than its factorization.

989181989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12521370.

The product of its digits is 3359232, while the sum is 62.

The square root of 989181989 is about 31451.2637107001. The cubic root of 989181989 is about 996.3809143531.

The spelling of 989181989 in words is "nine hundred eighty-nine million, one hundred eighty-one thousand, nine hundred eighty-nine".