812315671 has 2 divisors, whose sum is σ = 812315672. Its totient is φ = 812315670.

The previous prime is 812315663. The next prime is 812315677. The reversal of 812315671 is 176513218.

It is a happy number.

812315671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812315671 - 2³ = 812315663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812315677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406157835 + 406157836.

It is an arithmetic number, because the mean of its divisors is an integer number (406157836).

Almost surely, 2^812315671 is an apocalyptic number.

812315671 is a deficient number, since it is larger than the sum of its proper divisors (1).

812315671 is an equidigital number, since it uses as much as digits as its factorization.

812315671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 812315671 is about 28501.1520995205. The cubic root of 812315671 is about 933.0572187341.

Adding to 812315671 its reverse (176513218), we get a palindrome (988828889).

The spelling of 812315671 in words is "eight hundred twelve million, three hundred fifteen thousand, six hundred seventy-one".