989641 has 2 divisors, whose sum is σ = 989642.
Its totient is φ = 989640.
The previous prime is 989629. The next prime is 989647. The reversal of 989641 is 146989.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 960400 + 29241 = 980^2 + 171^2
It is an emirp because it is prime and its reverse (146989) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 989641 - 211 = 987593 is a prime.
989641 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 989641.
It is not a weakly prime, because it can be changed into another prime (989647) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494820 + 494821.
It is an arithmetic number, because the mean of its divisors is an integer number (494821).
2989641 is an apocalyptic number.
It is an amenable number.
989641 is a deficient number, since it is larger than the sum of its proper divisors (1).
989641 is an equidigital number, since it uses as much as digits as its factorization.
989641 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 15552, while the sum is 37.
The square root of 989641 is about 994.8070164610.
The cubic root of 989641 is about 99.6535007695.
The spelling of 989641 in words is "nine hundred eighty-nine thousand, six hundred forty-one".