810213 has 4 divisors (see below), whose sum is σ = 1080288. Its totient is φ = 540140.

The previous prime is 810209. The next prime is 810223. The reversal of 810213 is 312018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 810213 - 2² = 810209 is a prime.

It is an Ulam number.

It is a D-number.

810213 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 810192 and 810201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810223) 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 in 3 ways as a sum of consecutive naturals, for example, 135033 + ... + 135038.

It is an arithmetic number, because the mean of its divisors is an integer number (270072).

2⁸¹⁰²¹³ is an apocalyptic number.

It is an amenable number.

810213 is a deficient number, since it is larger than the sum of its proper divisors (270075).

810213 is a wasteful number, since it uses less digits than its factorization.

810213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270074.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 810213 is about 900.1183255550. The cubic root of 810213 is about 93.2251453332.

The spelling of 810213 in words is "eight hundred ten thousand, two hundred thirteen".