231122320 has 160 divisors (see below), whose sum is σ = 641208960. Its totient is φ = 76369920.

The previous prime is 231122303. The next prime is 231122323. The reversal of 231122320 is 23221132.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 231122294 and 231122303.

It is not an unprimeable number, because it can be changed into a prime (231122323) 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 31 ways as a sum of consecutive naturals, for example, 1018047 + ... + 1018273.

It is an arithmetic number, because the mean of its divisors is an integer number (4007556).

Almost surely, 2^231122320 is an apocalyptic number.

231122320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231122320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320604480).

231122320 is an abundant number, since it is smaller than the sum of its proper divisors (410086640).

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

231122320 is a wasteful number, since it uses less digits than its factorization.

231122320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231122320 is about 15202.7076535728. The cubic root of 231122320 is about 613.6875264620.

Adding to 231122320 its reverse (23221132), we get a palindrome (254343452).

The spelling of 231122320 in words is "two hundred thirty-one million, one hundred twenty-two thousand, three hundred twenty".