812284321 has 2 divisors, whose sum is σ = 812284322. Its totient is φ = 812284320.

The previous prime is 812284309. The next prime is 812284339. The reversal of 812284321 is 123482218.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684345600 + 127938721 = 26160^2 + 11311^2 .

It is a cyclic number.

It is not a de Polignac number, because 812284321 - 2⁹ = 812283809 is a prime.

It is not a weakly prime, because it can be changed into another prime (812284381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406142160 + 406142161.

It is an arithmetic number, because the mean of its divisors is an integer number (406142161).

Almost surely, 2^812284321 is an apocalyptic number.

It is an amenable number.

812284321 is a deficient number, since it is larger than the sum of its proper divisors (1).

812284321 is an equidigital number, since it uses as much as digits as its factorization.

812284321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 31.

The square root of 812284321 is about 28500.6021164466. The cubic root of 812284321 is about 933.0452153053.

The spelling of 812284321 in words is "eight hundred twelve million, two hundred eighty-four thousand, three hundred twenty-one".