812805611 has 2 divisors, whose sum is σ = 812805612. Its totient is φ = 812805610.

The previous prime is 812805589. The next prime is 812805661. The reversal of 812805611 is 116508218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812805611 - 2²⁶ = 745696747 is a prime.

It is a super-2 number, since 2×812805611² = 1321305922546166642, which contains 22 as substring.

It is equal to p_41770715 and since 812805611 and 41770715 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (812805661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406402805 + 406402806.

It is an arithmetic number, because the mean of its divisors is an integer number (406402806).

Almost surely, 2^812805611 is an apocalyptic number.

812805611 is a deficient number, since it is larger than the sum of its proper divisors (1).

812805611 is an equidigital number, since it uses as much as digits as its factorization.

812805611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 812805611 is about 28509.7458950444. The cubic root of 812805611 is about 933.2447690482.

The spelling of 812805611 in words is "eight hundred twelve million, eight hundred five thousand, six hundred eleven".