56111111191 has 2 divisors, whose sum is σ = 56111111192. Its totient is φ = 56111111190.

The previous prime is 56111111153. The next prime is 56111111219. The reversal of 56111111191 is 19111111165.

56111111191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (56111111219) can be obtained adding 56111111191 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56111111191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56111111101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28055555595 + 28055555596.

It is an arithmetic number, because the mean of its divisors is an integer number (28055555596).

Almost surely, 2^56111111191 is an apocalyptic number.

56111111191 is a deficient number, since it is larger than the sum of its proper divisors (1).

56111111191 is an equidigital number, since it uses as much as digits as its factorization.

56111111191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 28.

The spelling of 56111111191 in words is "fifty-six billion, one hundred eleven million, one hundred eleven thousand, one hundred ninety-one".