812289 has 4 divisors (see below), whose sum is σ = 1083056. Its totient is φ = 541524.

The previous prime is 812281. The next prime is 812297. The reversal of 812289 is 982218.

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 an interprime number because it is at equal distance from previous prime (812281) and next prime (812297).

It is not a de Polignac number, because 812289 - 2³ = 812281 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135379 + ... + 135384.

It is an arithmetic number, because the mean of its divisors is an integer number (270764).

2⁸¹²²⁸⁹ is an apocalyptic number.

It is an amenable number.

812289 is a deficient number, since it is larger than the sum of its proper divisors (270767).

812289 is a wasteful number, since it uses less digits than its factorization.

812289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270766.

The product of its digits is 2304, while the sum is 30.

The square root of 812289 is about 901.2707695249. The cubic root of 812289 is about 93.3047006841.

The spelling of 812289 in words is "eight hundred twelve thousand, two hundred eighty-nine".