989898787898873 has 2 divisors, whose sum is σ = 989898787898874. Its totient is φ = 989898787898872.

The previous prime is 989898787898869. The next prime is 989898787898921. The reversal of 989898787898873 is 378898787898989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837900267501049 + 151998520397824 = 28946507^2 + 12328768^2 .

It is a cyclic number.

It is not a de Polignac number, because 989898787898873 - 2² = 989898787898869 is a prime.

It is a super-2 number, since 2×989898787898873² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (989898787898833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949393949436 + 494949393949437.

It is an arithmetic number, because the mean of its divisors is an integer number (494949393949437).

Almost surely, 2^{989898787898873} is an apocalyptic number.

It is an amenable number.

989898787898873 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898787898873 is an equidigital number, since it uses as much as digits as its factorization.

989898787898873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14158437285888, while the sum is 116.

Adding to 989898787898873 its sum of digits (116), we get a palindrome (989898787898989).

The spelling of 989898787898873 in words is "nine hundred eighty-nine trillion, eight hundred ninety-eight billion, seven hundred eighty-seven million, eight hundred ninety-eight thousand, eight hundred seventy-three".