231320322 has 12 divisors (see below), whose sum is σ = 501194070. Its totient is φ = 77106768.

The previous prime is 231320317. The next prime is 231320329. The reversal of 231320322 is 223023132.

It is a happy number.

231320322 is a `hidden beast` number, since 23 + 1 + 320 + 322 = 666.

It can be written as a sum of positive squares in only one way, i.e., 212838921 + 18481401 = 14589^2 + 4299^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12851129 = 231320322 / (2 + 3 + 1 + 3 + 2 + 0 + 3 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 231320295 and 231320304.

It is not an unprimeable number, because it can be changed into a prime (231320329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6425547 + ... + 6425582.

Almost surely, 2^231320322 is an apocalyptic number.

231320322 is an abundant number, since it is smaller than the sum of its proper divisors (269873748).

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

231320322 is a wasteful number, since it uses less digits than its factorization.

231320322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12851137 (or 12851134 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 231320322 is about 15209.2183231092. The cubic root of 231320322 is about 613.8627247071.

Adding to 231320322 its reverse (223023132), we get a palindrome (454343454).

The spelling of 231320322 in words is "two hundred thirty-one million, three hundred twenty thousand, three hundred twenty-two".