231220331 has 8 divisors (see below), whose sum is σ = 236991744. Its totient is φ = 225466920.

The previous prime is 231220313. The next prime is 231220333. The reversal of 231220331 is 133022132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231220331 - 2⁶ = 231220267 is a prime.

It is a super-2 number, since 2×231220331² = 106925682935499122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220333) 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 7 ways as a sum of consecutive naturals, for example, 23666 + ... + 31976.

It is an arithmetic number, because the mean of its divisors is an integer number (29623968).

Almost surely, 2^231220331 is an apocalyptic number.

231220331 is a deficient number, since it is larger than the sum of its proper divisors (5771413).

231220331 is an equidigital number, since it uses as much as digits as its factorization.

231220331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231220331 is about 15205.9307837436. The cubic root of 231220331 is about 613.7742621032.

Adding to 231220331 its reverse (133022132), we get a palindrome (364242463).

The spelling of 231220331 in words is "two hundred thirty-one million, two hundred twenty thousand, three hundred thirty-one".