812671 has 2 divisors, whose sum is σ = 812672. Its totient is φ = 812670.

The previous prime is 812641. The next prime is 812681. The reversal of 812671 is 176218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812671 - 2⁵ = 812639 is a prime.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812641) 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, 406335 + 406336.

It is an arithmetic number, because the mean of its divisors is an integer number (406336).

2⁸¹²⁶⁷¹ is an apocalyptic number.

812671 is a deficient number, since it is larger than the sum of its proper divisors (1).

812671 is an equidigital number, since it uses as much as digits as its factorization.

812671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 812671 is about 901.4826676093. The cubic root of 812671 is about 93.3193247116.

Adding to 812671 its reverse (176218), we get a palindrome (988889).

The spelling of 812671 in words is "eight hundred twelve thousand, six hundred seventy-one".