811281289 has 27 divisors (see below), whose sum is σ = 1025189973. Its totient is φ = 639842112.

The previous prime is 811281283. The next prime is 811281307. The reversal of 811281289 is 982182118.

The square root of 811281289 is 28483.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 641760889 + 169520400 = 25333^2 + 13020^2 .

It is not a de Polignac number, because 811281289 - 2⁷ = 811281161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811281283) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2591797 + ... + 2592109.

It is an arithmetic number, because the mean of its divisors is an integer number (37969999).

Almost surely, 2^811281289 is an apocalyptic number.

811281289 is the 28483-rd square number.

811281289 is the 14242-nd centered octagonal number.

It is an amenable number.

811281289 is a deficient number, since it is larger than the sum of its proper divisors (213908684).

811281289 is an equidigital number, since it uses as much as digits as its factorization.

811281289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 333 counting only the distinct ones).

The product of its digits is 18432, while the sum is 40.

The cubic root of 811281289 is about 932.6610067782.

It can be divided in two parts, 8112 and 81289, that added together give a square (89401 = 299²).

The spelling of 811281289 in words is "eight hundred eleven million, two hundred eighty-one thousand, two hundred eighty-nine".