1208938212989 has 4 divisors (see below), whose sum is σ = 1301933460156. Its totient is φ = 1115942965824.

The previous prime is 1208938212949. The next prime is 1208938212997. The reversal of 1208938212989 is 9892128398021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 819175236889 + 389762976100 = 905083^2 + 624310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1208938212989 - 2¹⁶ = 1208938147453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1208938212919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46497623564 + ... + 46497623589.

It is an arithmetic number, because the mean of its divisors is an integer number (325483365039).

Almost surely, 2^{1208938212989} is an apocalyptic number.

It is an amenable number.

1208938212989 is a deficient number, since it is larger than the sum of its proper divisors (92995247167).

1208938212989 is an equidigital number, since it uses as much as digits as its factorization.

1208938212989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92995247166.

The product of its (nonzero) digits is 8957952, while the sum is 62.

The spelling of 1208938212989 in words is "one trillion, two hundred eight billion, nine hundred thirty-eight million, two hundred twelve thousand, nine hundred eighty-nine".