990000989489 has 2 divisors, whose sum is σ = 990000989490. Its totient is φ = 990000989488.

The previous prime is 990000989473. The next prime is 990000989531. The reversal of 990000989489 is 984989000099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673684733089 + 316316256400 = 820783^2 + 562420^2 .

It is a cyclic number.

It is not a de Polignac number, because 990000989489 - 2⁴ = 990000989473 is a prime.

It is a super-2 number, since 2×990000989489² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990000989429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495000494744 + 495000494745.

It is an arithmetic number, because the mean of its divisors is an integer number (495000494745).

Almost surely, 2^990000989489 is an apocalyptic number.

It is an amenable number.

990000989489 is a deficient number, since it is larger than the sum of its proper divisors (1).

990000989489 is an equidigital number, since it uses as much as digits as its factorization.

990000989489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15116544, while the sum is 65.

The spelling of 990000989489 in words is "nine hundred ninety billion, nine hundred eighty-nine thousand, four hundred eighty-nine".