56905790891 has 2 divisors, whose sum is σ = 56905790892. Its totient is φ = 56905790890.

The previous prime is 56905790873. The next prime is 56905790933. The reversal of 56905790891 is 19809750965.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56905790891 - 2⁶ = 56905790827 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56905790891.

It is not a weakly prime, because it can be changed into another prime (56905790861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28452895445 + 28452895446.

It is an arithmetic number, because the mean of its divisors is an integer number (28452895446).

Almost surely, 2^56905790891 is an apocalyptic number.

56905790891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56905790891 is an equidigital number, since it uses as much as digits as its factorization.

56905790891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6123600, while the sum is 59.

The spelling of 56905790891 in words is "fifty-six billion, nine hundred five million, seven hundred ninety thousand, eight hundred ninety-one".