812208418591 has 2 divisors, whose sum is σ = 812208418592. Its totient is φ = 812208418590.

The previous prime is 812208418513. The next prime is 812208418657. The reversal of 812208418591 is 195814802218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812208418591 - 2¹⁵ = 812208385823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812208419591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406104209295 + 406104209296.

It is an arithmetic number, because the mean of its divisors is an integer number (406104209296).

Almost surely, 2^812208418591 is an apocalyptic number.

812208418591 is a deficient number, since it is larger than the sum of its proper divisors (1).

812208418591 is an equidigital number, since it uses as much as digits as its factorization.

812208418591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 49.

The spelling of 812208418591 in words is "eight hundred twelve billion, two hundred eight million, four hundred eighteen thousand, five hundred ninety-one".