812869 has 2 divisors, whose sum is σ = 812870. Its totient is φ = 812868.

The previous prime is 812857. The next prime is 812921. The reversal of 812869 is 968218.

812869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 315844 = 705^2 + 562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812869 is a prime.

It is a super-2 number, since 2×812869² = 1321512022322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406434 + 406435.

It is an arithmetic number, because the mean of its divisors is an integer number (406435).

2⁸¹²⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

812869 is a deficient number, since it is larger than the sum of its proper divisors (1).

812869 is an equidigital number, since it uses as much as digits as its factorization.

812869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 812869 is about 901.5924800041. The cubic root of 812869 is about 93.3269029016.

It can be divided in two parts, 812 and 869, that added together give a square (1681 = 41²).

The spelling of 812869 in words is "eight hundred twelve thousand, eight hundred sixty-nine".