811849 has 4 divisors (see below), whose sum is σ = 825220. Its totient is φ = 798480.

The previous prime is 811819. The next prime is 811861. The reversal of 811849 is 948118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948118 = 2 ⋅474059.

It can be written as a sum of positive squares in 2 ways, for example, as 14400 + 797449 = 120^2 + 893^2 .

It is a cyclic number.

It is not a de Polignac number, because 811849 - 2⁹ = 811337 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 811849.

It is not an unprimeable number, because it can be changed into a prime (811819) 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, 6594 + ... + 6715.

It is an arithmetic number, because the mean of its divisors is an integer number (206305).

2⁸¹¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

811849 is a deficient number, since it is larger than the sum of its proper divisors (13371).

811849 is a wasteful number, since it uses less digits than its factorization.

811849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13370.

The product of its digits is 2304, while the sum is 31.

The square root of 811849 is about 901.0266366762. The cubic root of 811849 is about 93.2878505716.

It can be divided in two parts, 81 and 1849, that multiplied together give a square (149769 = 387²).

The spelling of 811849 in words is "eight hundred eleven thousand, eight hundred forty-nine".