1289204368909 has 16 divisors (see below), whose sum is σ = 1295086665600. Its totient is φ = 1283339842560.

The previous prime is 1289204368901. The next prime is 1289204368931. The reversal of 1289204368909 is 9098634029821.

It is a cyclic number.

It is not a de Polignac number, because 1289204368909 - 2³ = 1289204368901 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 (1289204368901) 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, 497185117 + ... + 497187709.

It is an arithmetic number, because the mean of its divisors is an integer number (80942916600).

Almost surely, 2^{1289204368909} is an apocalyptic number.

It is an amenable number.

1289204368909 is a deficient number, since it is larger than the sum of its proper divisors (5882296691).

1289204368909 is a wasteful number, since it uses less digits than its factorization.

1289204368909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220.

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 1289204368909 in words is "one trillion, two hundred eighty-nine billion, two hundred four million, three hundred sixty-eight thousand, nine hundred nine".