811421 has 4 divisors (see below), whose sum is σ = 873852. Its totient is φ = 748992.

The previous prime is 811411. The next prime is 811429. The reversal of 811421 is 124118.

811421 = 164² + 165² + ... + 189².

811421 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.

It can be written as a sum of positive squares in 2 ways, for example, as 45796 + 765625 = 214^2 + 875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 811421.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 811421.

It is not an unprimeable number, because it can be changed into a prime (811429) 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, 31196 + ... + 31221.

It is an arithmetic number, because the mean of its divisors is an integer number (218463).

2⁸¹¹⁴²¹ is an apocalyptic number.

It is an amenable number.

811421 is a deficient number, since it is larger than the sum of its proper divisors (62431).

811421 is a wasteful number, since it uses less digits than its factorization.

811421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62430.

The product of its digits is 64, while the sum is 17.

The square root of 811421 is about 900.7890985131. The cubic root of 811421 is about 93.2714541651.

Adding to 811421 its reverse (124118), we get a palindrome (935539).

The spelling of 811421 in words is "eight hundred eleven thousand, four hundred twenty-one".