231320233 has 4 divisors (see below), whose sum is σ = 238782208. Its totient is φ = 223858260.

The previous prime is 231320227. The next prime is 231320251. The reversal of 231320233 is 332023132.

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.

It is a cyclic number.

It is not a de Polignac number, because 231320233 - 2⁹ = 231319721 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 231320233.

It is not an unprimeable number, because it can be changed into a prime (231320273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3730941 + ... + 3731002.

It is an arithmetic number, because the mean of its divisors is an integer number (59695552).

Almost surely, 2^231320233 is an apocalyptic number.

It is an amenable number.

231320233 is a deficient number, since it is larger than the sum of its proper divisors (7461975).

231320233 is an equidigital number, since it uses as much as digits as its factorization.

231320233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7461974.

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

The square root of 231320233 is about 15209.2153972518. The cubic root of 231320233 is about 613.8626459796.

Adding to 231320233 its reverse (332023132), we get a palindrome (563343365).

The spelling of 231320233 in words is "two hundred thirty-one million, three hundred twenty thousand, two hundred thirty-three".