823231281 has 4 divisors (see below), whose sum is σ = 1097641712. Its totient is φ = 548820852.

The previous prime is 823231261. The next prime is 823231289. The reversal of 823231281 is 182132328.

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 not a de Polignac number, because 823231281 - 2¹⁴ = 823214897 is a prime.

It is a super-2 number, since 2×823231281² = 1355419484033801922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823231289) 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, 137205211 + ... + 137205216.

It is an arithmetic number, because the mean of its divisors is an integer number (274410428).

Almost surely, 2^823231281 is an apocalyptic number.

It is an amenable number.

823231281 is a deficient number, since it is larger than the sum of its proper divisors (274410431).

823231281 is a wasteful number, since it uses less digits than its factorization.

823231281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274410430.

The product of its digits is 4608, while the sum is 30.

The square root of 823231281 is about 28692.0072668330. The cubic root of 823231281 is about 937.2180010146.

The spelling of 823231281 in words is "eight hundred twenty-three million, two hundred thirty-one thousand, two hundred eighty-one".