812641 has 2 divisors, whose sum is σ = 812642. Its totient is φ = 812640.

The previous prime is 812639. The next prime is 812671. The reversal of 812641 is 146218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 772641 + 40000 = 879^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 812641 - 2¹ = 812639 is a prime.

Together with 812639, it forms a pair of twin primes.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (812671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406320 + 406321.

It is an arithmetic number, because the mean of its divisors is an integer number (406321).

2⁸¹²⁶⁴¹ is an apocalyptic number.

It is an amenable number.

812641 is a deficient number, since it is larger than the sum of its proper divisors (1).

812641 is an equidigital number, since it uses as much as digits as its factorization.

812641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 812641 is about 901.4660282007. The cubic root of 812641 is about 93.3181763936.

Adding to 812641 its reverse (146218), we get a palindrome (958859).

The spelling of 812641 in words is "eight hundred twelve thousand, six hundred forty-one".