812001 has 4 divisors (see below), whose sum is σ = 1082672. Its totient is φ = 541332.

The previous prime is 811997. The next prime is 812011. The reversal of 812001 is 100218.

It is a happy number.

812001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 812001 - 2² = 811997 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 (812011) 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, 135331 + ... + 135336.

It is an arithmetic number, because the mean of its divisors is an integer number (270668).

2⁸¹²⁰⁰¹ is an apocalyptic number.

It is an amenable number.

812001 is a deficient number, since it is larger than the sum of its proper divisors (270671).

812001 is a wasteful number, since it uses less digits than its factorization.

812001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270670.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 812001 is about 901.1109809563. The cubic root of 812001 is about 93.2936722077.

Adding to 812001 its reverse (100218), we get a palindrome (912219).

The spelling of 812001 in words is "eight hundred twelve thousand, one".