989011835681 has 4 divisors (see below), whose sum is σ = 1015741885332. Its totient is φ = 962281786032.

The previous prime is 989011835677. The next prime is 989011835717. The reversal of 989011835681 is 186538110989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186538110989 = 31 ⋅6017358419.

It can be written as a sum of positive squares in 2 ways, for example, as 384101218081 + 604910617600 = 619759^2 + 777760^2 .

It is a cyclic number.

It is not a de Polignac number, because 989011835681 - 2² = 989011835677 is a prime.

It is a super-2 number, since 2×989011835681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989011835681.

It is not an unprimeable number, because it can be changed into a prime (989011855681) 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, 13365024770 + ... + 13365024843.

It is an arithmetic number, because the mean of its divisors is an integer number (253935471333).

Almost surely, 2^989011835681 is an apocalyptic number.

It is an amenable number.

989011835681 is a deficient number, since it is larger than the sum of its proper divisors (26730049651).

989011835681 is a wasteful number, since it uses less digits than its factorization.

989011835681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26730049650.

The product of its (nonzero) digits is 3732480, while the sum is 59.

The spelling of 989011835681 in words is "nine hundred eighty-nine billion, eleven million, eight hundred thirty-five thousand, six hundred eighty-one".