900089989 has 2 divisors, whose sum is σ = 900089990. Its totient is φ = 900089988.

The previous prime is 900089987. The next prime is 900090049. The reversal of 900089989 is 989980009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897481764 + 2608225 = 29958^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 900089989 - 2¹ = 900089987 is a prime.

Together with 900089987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900089987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450044994 + 450044995.

It is an arithmetic number, because the mean of its divisors is an integer number (450044995).

Almost surely, 2^900089989 is an apocalyptic number.

It is an amenable number.

900089989 is a deficient number, since it is larger than the sum of its proper divisors (1).

900089989 is an equidigital number, since it uses as much as digits as its factorization.

900089989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 900089989 is about 30001.4997791777. The cubic root of 900089989 is about 965.5215625792.

It can be divided in two parts, 9000 and 89989, that added together give a palindrome (98989).

The spelling of 900089989 in words is "nine hundred million, eighty-nine thousand, nine hundred eighty-nine".