11691121236 has 24 divisors (see below), whose sum is σ = 27332891040. Its totient is φ = 3889382112.

The previous prime is 11691121217. The next prime is 11691121243. The reversal of 11691121236 is 63212119611.

It is a junction number, because it is equal to n+sod(n) for n = 11691121197 and 11691121206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950926 + ... + 963141.

It is an arithmetic number, because the mean of its divisors is an integer number (1138870460).

Almost surely, 2^11691121236 is an apocalyptic number.

It is an amenable number.

11691121236 is an abundant number, since it is smaller than the sum of its proper divisors (15641769804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11691121236 is a wasteful number, since it uses less digits than its factorization.

11691121236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914583 (or 1914581 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The spelling of 11691121236 in words is "eleven billion, six hundred ninety-one million, one hundred twenty-one thousand, two hundred thirty-six".