811441 has 2 divisors, whose sum is σ = 811442. Its totient is φ = 811440.

The previous prime is 811429. The next prime is 811457. The reversal of 811441 is 144118.

811441 = T₇₃₄ + T₇₃₅ + T₇₃₆.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519841 + 291600 = 721^2 + 540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811441 is a prime.

It is not a weakly prime, because it can be changed into another prime (811411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405720 + 405721.

It is an arithmetic number, because the mean of its divisors is an integer number (405721).

2⁸¹¹⁴⁴¹ is an apocalyptic number.

811441 is the 736-th centered triangular number.

It is an amenable number.

811441 is a deficient number, since it is larger than the sum of its proper divisors (1).

811441 is an equidigital number, since it uses as much as digits as its factorization.

811441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 19.

The square root of 811441 is about 900.8001998224. The cubic root of 811441 is about 93.2722204808.

Adding to 811441 its reverse (144118), we get a palindrome (955559).

It can be divided in two parts, 8 and 11441, that added together give a square (11449 = 107²).

The spelling of 811441 in words is "eight hundred eleven thousand, four hundred forty-one".