989812129 has 2 divisors, whose sum is σ = 989812130. Its totient is φ = 989812128.

The previous prime is 989812127. The next prime is 989812147. The reversal of 989812129 is 921218989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 769230225 + 220581904 = 27735^2 + 14852^2 .

It is an emirp because it is prime and its reverse (921218989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989812129 - 2¹ = 989812127 is a prime.

Together with 989812127, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (989812127) 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 as a sum of consecutive naturals, namely, 494906064 + 494906065.

It is an arithmetic number, because the mean of its divisors is an integer number (494906065).

Almost surely, 2^989812129 is an apocalyptic number.

It is an amenable number.

989812129 is a deficient number, since it is larger than the sum of its proper divisors (1).

989812129 is an equidigital number, since it uses as much as digits as its factorization.

989812129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 49.

The square root of 989812129 is about 31461.2798372857. The cubic root of 989812129 is about 996.5924447561.

The spelling of 989812129 in words is "nine hundred eighty-nine million, eight hundred twelve thousand, one hundred twenty-nine".