812901 has 4 divisors (see below), whose sum is σ = 1083872. Its totient is φ = 541932.

The previous prime is 812869. The next prime is 812921. The reversal of 812901 is 109218.

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 812901 - 2⁵ = 812869 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812921) 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, 135481 + ... + 135486.

It is an arithmetic number, because the mean of its divisors is an integer number (270968).

2⁸¹²⁹⁰¹ is an apocalyptic number.

It is an amenable number.

812901 is a deficient number, since it is larger than the sum of its proper divisors (270971).

812901 is a wasteful number, since it uses less digits than its factorization.

812901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270970.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 812901 is about 901.6102262064. The cubic root of 812901 is about 93.3281275441.

The spelling of 812901 in words is "eight hundred twelve thousand, nine hundred one".