13121991289 has 12 divisors (see below), whose sum is σ = 14478222528. Its totient is φ = 11883696440.

The previous prime is 13121991287. The next prime is 13121991293. The reversal of 13121991289 is 98219912131.

It is not a de Polignac number, because 13121991289 - 2¹ = 13121991287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13121991287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174349 + ... + 237994.

It is an arithmetic number, because the mean of its divisors is an integer number (1206518544).

Almost surely, 2^13121991289 is an apocalyptic number.

It is an amenable number.

13121991289 is a deficient number, since it is larger than the sum of its proper divisors (1356231239).

13121991289 is a wasteful number, since it uses less digits than its factorization.

13121991289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412628 (or 412617 counting only the distinct ones).

The product of its digits is 69984, while the sum is 46.

The spelling of 13121991289 in words is "thirteen billion, one hundred twenty-one million, nine hundred ninety-one thousand, two hundred eighty-nine".