11691431289 has 48 divisors (see below), whose sum is σ = 17325235200. Its totient is φ = 7595596800.

The previous prime is 11691431237. The next prime is 11691431317. The reversal of 11691431289 is 98213419611.

It is not a de Polignac number, because 11691431289 - 2¹³ = 11691423097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11691431189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29155489 + ... + 29155889.

It is an arithmetic number, because the mean of its divisors is an integer number (360942400).

Almost surely, 2^11691431289 is an apocalyptic number.

It is an amenable number.

11691431289 is a deficient number, since it is larger than the sum of its proper divisors (5633803911).

11691431289 is a wasteful number, since it uses less digits than its factorization.

11691431289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 899 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The spelling of 11691431289 in words is "eleven billion, six hundred ninety-one million, four hundred thirty-one thousand, two hundred eighty-nine".