123208549989 has 16 divisors (see below), whose sum is σ = 189681894528. Its totient is φ = 69679060992.

The previous prime is 123208549951. The next prime is 123208549991. The reversal of 123208549989 is 989945802321.

It is not a de Polignac number, because 123208549989 - 2¹⁹ = 123208025701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123208549909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30240612 + ... + 30244685.

It is an arithmetic number, because the mean of its divisors is an integer number (11855118408).

Almost surely, 2^123208549989 is an apocalyptic number.

It is an amenable number.

123208549989 is a deficient number, since it is larger than the sum of its proper divisors (66473344539).

123208549989 is an equidigital number, since it uses as much as digits as its factorization.

123208549989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60485404.

The product of its (nonzero) digits is 11197440, while the sum is 60.

The spelling of 123208549989 in words is "one hundred twenty-three billion, two hundred eight million, five hundred forty-nine thousand, nine hundred eighty-nine".