56840357491 has 2 divisors, whose sum is σ = 56840357492. Its totient is φ = 56840357490.

The previous prime is 56840357461. The next prime is 56840357543. The reversal of 56840357491 is 19475304865.

It is an a-pointer prime, because the next prime (56840357543) can be obtained adding 56840357491 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56840357491 - 2¹⁹ = 56839833203 is a prime.

It is not a weakly prime, because it can be changed into another prime (56840357461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28420178745 + 28420178746.

It is an arithmetic number, because the mean of its divisors is an integer number (28420178746).

Almost surely, 2^56840357491 is an apocalyptic number.

56840357491 is a deficient number, since it is larger than the sum of its proper divisors (1).

56840357491 is an equidigital number, since it uses as much as digits as its factorization.

56840357491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 56840357491 in words is "fifty-six billion, eight hundred forty million, three hundred fifty-seven thousand, four hundred ninety-one".