820224231 has 4 divisors (see below), whose sum is σ = 1093632312. Its totient is φ = 546816152.

The previous prime is 820224227. The next prime is 820224233. The reversal of 820224231 is 132422028.

820224231 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 is a cyclic number.

It is not a de Polignac number, because 820224231 - 2² = 820224227 is a prime.

It is a super-2 number, since 2×820224231² = 1345535578239082722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820224233) 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, 136704036 + ... + 136704041.

It is an arithmetic number, because the mean of its divisors is an integer number (273408078).

Almost surely, 2^820224231 is an apocalyptic number.

820224231 is a deficient number, since it is larger than the sum of its proper divisors (273408081).

820224231 is a wasteful number, since it uses less digits than its factorization.

820224231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273408080.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 820224231 is about 28639.5571020224. The cubic root of 820224231 is about 936.0754708029.

Adding to 820224231 its reverse (132422028), we get a palindrome (952646259).

The spelling of 820224231 in words is "eight hundred twenty million, two hundred twenty-four thousand, two hundred thirty-one".