809213 has 2 divisors, whose sum is σ = 809214. Its totient is φ = 809212.

The previous prime is 809203. The next prime is 809231. The reversal of 809213 is 312908.

Together with next prime (809231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806404 + 2809 = 898^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 809213 - 2⁸ = 808957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404606 + 404607.

It is an arithmetic number, because the mean of its divisors is an integer number (404607).

2⁸⁰⁹²¹³ is an apocalyptic number.

It is an amenable number.

809213 is a deficient number, since it is larger than the sum of its proper divisors (1).

809213 is an equidigital number, since it uses as much as digits as its factorization.

809213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 809213 is about 899.5626715243. The cubic root of 809213 is about 93.1867753713.

The spelling of 809213 in words is "eight hundred nine thousand, two hundred thirteen".