231620222 has 32 divisors (see below), whose sum is σ = 377650080. Its totient is φ = 106168320.

The previous prime is 231620219. The next prime is 231620227. The reversal of 231620222 is 222026132.

It is a junction number, because it is equal to n+sod(n) for n = 231620194 and 231620203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231620227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 361022 + ... + 361662.

It is an arithmetic number, because the mean of its divisors is an integer number (11801565).

Almost surely, 2^231620222 is an apocalyptic number.

231620222 is a deficient number, since it is larger than the sum of its proper divisors (146029858).

231620222 is a wasteful number, since it uses less digits than its factorization.

231620222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 231620222 is about 15219.0742819660. The cubic root of 231620222 is about 614.1278951395.

Adding to 231620222 its reverse (222026132), we get a palindrome (453646354).

The spelling of 231620222 in words is "two hundred thirty-one million, six hundred twenty thousand, two hundred twenty-two".