231720822 has 24 divisors (see below), whose sum is σ = 510294720. Its totient is φ = 75973680.

The previous prime is 231720809. The next prime is 231720869. The reversal of 231720822 is 228027132.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104422 + ... + 106617.

It is an arithmetic number, because the mean of its divisors is an integer number (21262280).

Almost surely, 2^231720822 is an apocalyptic number.

231720822 is an abundant number, since it is smaller than the sum of its proper divisors (278573898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231720822 is a wasteful number, since it uses less digits than its factorization.

231720822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211108 (or 211105 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 231720822 is about 15222.3789862163. The cubic root of 231720822 is about 614.2167940035.

Adding to 231720822 its reverse (228027132), we get a palindrome (459747954).

The spelling of 231720822 in words is "two hundred thirty-one million, seven hundred twenty thousand, eight hundred twenty-two".