989220173 has 2 divisors, whose sum is σ = 989220174. Its totient is φ = 989220172.

The previous prime is 989220151. The next prime is 989220217. The reversal of 989220173 is 371022989.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811851049 + 177369124 = 28493^2 + 13318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989220173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989220173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989220773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494610086 + 494610087.

It is an arithmetic number, because the mean of its divisors is an integer number (494610087).

Almost surely, 2^989220173 is an apocalyptic number.

It is an amenable number.

989220173 is a deficient number, since it is larger than the sum of its proper divisors (1).

989220173 is an equidigital number, since it uses as much as digits as its factorization.

989220173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 989220173 is about 31451.8707392740. The cubic root of 989220173 is about 996.3937348181.

The spelling of 989220173 in words is "nine hundred eighty-nine million, two hundred twenty thousand, one hundred seventy-three".