812149 has 4 divisors (see below), whose sum is σ = 874636. Its totient is φ = 749664.

The previous prime is 812137. The next prime is 812167. The reversal of 812149 is 941218.

It is a happy number.

812149 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 an emirpimes, since its reverse is a distinct semiprime: 941218 = 2 ⋅470609.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 552049 = 510^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 812149 - 2⁹ = 811637 is a prime.

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

It is a Duffinian number.

812149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812129) 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, 31224 + ... + 31249.

It is an arithmetic number, because the mean of its divisors is an integer number (218659).

2⁸¹²¹⁴⁹ is an apocalyptic number.

It is an amenable number.

812149 is a deficient number, since it is larger than the sum of its proper divisors (62487).

812149 is a wasteful number, since it uses less digits than its factorization.

812149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62486.

The product of its digits is 576, while the sum is 25.

The square root of 812149 is about 901.1930980650. The cubic root of 812149 is about 93.2993399449.

It can be divided in two parts, 812 and 149, that added together give a square (961 = 31²).

The spelling of 812149 in words is "eight hundred twelve thousand, one hundred forty-nine".