56505191 has 4 divisors (see below), whose sum is σ = 56601072. Its totient is φ = 56409312.

The previous prime is 56505151. The next prime is 56505199. The reversal of 56505191 is 19150565.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56505191 - 2¹⁰ = 56504167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56505199) 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, 47051 + ... + 48236.

It is an arithmetic number, because the mean of its divisors is an integer number (14150268).

Almost surely, 2^56505191 is an apocalyptic number.

56505191 is a deficient number, since it is larger than the sum of its proper divisors (95881).

56505191 is an equidigital number, since it uses as much as digits as its factorization.

56505191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95880.

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

The square root of 56505191 is about 7516.9934814392. The cubic root of 56505191 is about 383.7332651935.

The spelling of 56505191 in words is "fifty-six million, five hundred five thousand, one hundred ninety-one".