812197 has 4 divisors (see below), whose sum is σ = 814720. Its totient is φ = 809676.

The previous prime is 812191. The next prime is 812213. The reversal of 812197 is 791218.

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 812197 - 2¹¹ = 810149 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693 + ... + 1450.

It is an arithmetic number, because the mean of its divisors is an integer number (203680).

2⁸¹²¹⁹⁷ is an apocalyptic number.

It is an amenable number.

812197 is a deficient number, since it is larger than the sum of its proper divisors (2523).

812197 is a wasteful number, since it uses less digits than its factorization.

812197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522.

The product of its digits is 1008, while the sum is 28.

The square root of 812197 is about 901.2197290339. The cubic root of 812197 is about 93.3011779820.

It can be divided in two parts, 81 and 2197, that added together give a triangular number (2278 = T₆₇).

The spelling of 812197 in words is "eight hundred twelve thousand, one hundred ninety-seven".