11938071191 has 4 divisors (see below), whose sum is σ = 11976457584. Its totient is φ = 11899684800.

The previous prime is 11938071169. The next prime is 11938071193. The reversal of 11938071191 is 19117083911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19117083911 = 5903 ⋅3238537.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11938071191 is a prime.

It is a super-2 number, since 2×11938071191² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11938071193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19192730 + ... + 19193351.

It is an arithmetic number, because the mean of its divisors is an integer number (2994114396).

Almost surely, 2^11938071191 is an apocalyptic number.

11938071191 is a deficient number, since it is larger than the sum of its proper divisors (38386393).

11938071191 is an equidigital number, since it uses as much as digits as its factorization.

11938071191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38386392.

The product of its (nonzero) digits is 13608, while the sum is 41.

The spelling of 11938071191 in words is "eleven billion, nine hundred thirty-eight million, seventy-one thousand, one hundred ninety-one".