11691121237 has 16 divisors (see below), whose sum is σ = 12322759680. Its totient is φ = 11069955072.

The previous prime is 11691121217. The next prime is 11691121243. The reversal of 11691121237 is 73212119611.

It is a happy number.

11691121237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11691121237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11691121217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5296188 + ... + 5298394.

It is an arithmetic number, because the mean of its divisors is an integer number (770172480).

Almost surely, 2^11691121237 is an apocalyptic number.

It is an amenable number.

11691121237 is a deficient number, since it is larger than the sum of its proper divisors (631638443).

11691121237 is a wasteful number, since it uses less digits than its factorization.

11691121237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452.

The product of its digits is 4536, while the sum is 34.

The spelling of 11691121237 in words is "eleven billion, six hundred ninety-one million, one hundred twenty-one thousand, two hundred thirty-seven".