56055191 has 2 divisors, whose sum is σ = 56055192. Its totient is φ = 56055190.

The previous prime is 56055151. The next prime is 56055193. The reversal of 56055191 is 19155065.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56055191 is a prime.

Together with 56055193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56055193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28027595 + 28027596.

It is an arithmetic number, because the mean of its divisors is an integer number (28027596).

Almost surely, 2^56055191 is an apocalyptic number.

56055191 is a deficient number, since it is larger than the sum of its proper divisors (1).

56055191 is an equidigital number, since it uses as much as digits as its factorization.

56055191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 56055191 is about 7487.0014692132. The cubic root of 56055191 is about 382.7118816974.

The spelling of 56055191 in words is "fifty-six million, fifty-five thousand, one hundred ninety-one".