231121233 has 24 divisors (see below), whose sum is σ = 382095168. Its totient is φ = 131874912.

The previous prime is 231121217. The next prime is 231121237. The reversal of 231121233 is 332121132.

It is not a de Polignac number, because 231121233 - 2⁴ = 231121217 is a prime.

It is a super-4 number, since 4×231121233⁴ (a number of 35 digits) contains 4444 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231121237) 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 23 ways as a sum of consecutive naturals, for example, 47910 + ... + 52512.

It is an arithmetic number, because the mean of its divisors is an integer number (15920632).

Almost surely, 2^231121233 is an apocalyptic number.

It is an amenable number.

231121233 is a deficient number, since it is larger than the sum of its proper divisors (150973935).

231121233 is a wasteful number, since it uses less digits than its factorization.

231121233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5413 (or 5410 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231121233 is about 15202.6719033202. The cubic root of 231121233 is about 613.6865643749.

Adding to 231121233 its reverse (332121132), we get a palindrome (563242365).

The spelling of 231121233 in words is "two hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-three".