812447747 has 2 divisors, whose sum is σ = 812447748. Its totient is φ = 812447746.

The previous prime is 812447651. The next prime is 812447749. The reversal of 812447747 is 747744218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812447747 - 2¹⁶ = 812382211 is a prime.

Together with 812447749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 812447698 and 812447707.

It is not a weakly prime, because it can be changed into another prime (812447749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406223873 + 406223874.

It is an arithmetic number, because the mean of its divisors is an integer number (406223874).

Almost surely, 2^812447747 is an apocalyptic number.

812447747 is a deficient number, since it is larger than the sum of its proper divisors (1).

812447747 is an equidigital number, since it uses as much as digits as its factorization.

812447747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 351232, while the sum is 44.

The square root of 812447747 is about 28503.4690344877. The cubic root of 812447747 is about 933.1077851954.

The spelling of 812447747 in words is "eight hundred twelve million, four hundred forty-seven thousand, seven hundred forty-seven".