812135 has 8 divisors (see below), whose sum is σ = 991440. Its totient is φ = 638464.

The previous prime is 812129. The next prime is 812137. The reversal of 812135 is 531218.

812135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812135 - 2⁸ = 811879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (123930).

2⁸¹²¹³⁵ is an apocalyptic number.

812135 is a deficient number, since it is larger than the sum of its proper divisors (179305).

812135 is a wasteful number, since it uses less digits than its factorization.

812135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817.

The product of its digits is 240, while the sum is 20.

The square root of 812135 is about 901.1853305508. The cubic root of 812135 is about 93.2988038371.

It can be divided in two parts, 81213 and 5, that added together give a palindrome (81218).

The spelling of 812135 in words is "eight hundred twelve thousand, one hundred thirty-five".