811949 has 4 divisors (see below), whose sum is σ = 819936. Its totient is φ = 803964.

The previous prime is 811933. The next prime is 811957. The reversal of 811949 is 949118.

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 a cyclic number.

It is not a de Polignac number, because 811949 - 2⁴ = 811933 is a prime.

It is a super-2 number, since 2×811949² = 1318522357202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811919) 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, 3839 + ... + 4044.

It is an arithmetic number, because the mean of its divisors is an integer number (204984).

2⁸¹¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

811949 is a deficient number, since it is larger than the sum of its proper divisors (7987).

811949 is a wasteful number, since it uses less digits than its factorization.

811949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986.

The product of its digits is 2592, while the sum is 32.

The square root of 811949 is about 901.0821272226. The cubic root of 811949 is about 93.2916806771.

The spelling of 811949 in words is "eight hundred eleven thousand, nine hundred forty-nine".