812281 has 2 divisors, whose sum is σ = 812282. Its totient is φ = 812280.

The previous prime is 812267. The next prime is 812297. The reversal of 812281 is 182218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 46656 = 875^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 812281 - 2⁵ = 812249 is a prime.

It is a super-2 number, since 2×812281² = 1319600845922, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (812221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406140 + 406141.

It is an arithmetic number, because the mean of its divisors is an integer number (406141).

2⁸¹²²⁸¹ is an apocalyptic number.

It is an amenable number.

812281 is a deficient number, since it is larger than the sum of its proper divisors (1).

812281 is an equidigital number, since it uses as much as digits as its factorization.

812281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 22.

The square root of 812281 is about 901.2663313361. The cubic root of 812281 is about 93.3043943728.

Adding to 812281 its reverse (182218), we get a palindrome (994499).

The spelling of 812281 in words is "eight hundred twelve thousand, two hundred eighty-one".