331220233 has 4 divisors (see below), whose sum is σ = 338267520. Its totient is φ = 324172948.

The previous prime is 331220209. The next prime is 331220243. The reversal of 331220233 is 332022133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 332022133 = 2011 ⋅165103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331220233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331220233.

It is not an unprimeable number, because it can be changed into a prime (331220243) 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 3 ways as a sum of consecutive naturals, for example, 3523573 + ... + 3523666.

It is an arithmetic number, because the mean of its divisors is an integer number (84566880).

Almost surely, 2^331220233 is an apocalyptic number.

It is an amenable number.

331220233 is a deficient number, since it is larger than the sum of its proper divisors (7047287).

331220233 is an equidigital number, since it uses as much as digits as its factorization.

331220233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047286.

The product of its (nonzero) digits is 648, while the sum is 19.

The square root of 331220233 is about 18199.4569424475. The cubic root of 331220233 is about 691.8930254689.

Adding to 331220233 its reverse (332022133), we get a palindrome (663242366).

The spelling of 331220233 in words is "three hundred thirty-one million, two hundred twenty thousand, two hundred thirty-three".