56309191 has 2 divisors, whose sum is σ = 56309192. Its totient is φ = 56309190.

The previous prime is 56309147. The next prime is 56309203. The reversal of 56309191 is 19190365.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56309191 - 2¹¹ = 56307143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56309111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28154595 + 28154596.

It is an arithmetic number, because the mean of its divisors is an integer number (28154596).

Almost surely, 2^56309191 is an apocalyptic number.

56309191 is a deficient number, since it is larger than the sum of its proper divisors (1).

56309191 is an equidigital number, since it uses as much as digits as its factorization.

56309191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 56309191 is about 7503.9450291164. The cubic root of 56309191 is about 383.2890649993.

The spelling of 56309191 in words is "fifty-six million, three hundred nine thousand, one hundred ninety-one".