231213233 has 4 divisors (see below), whose sum is σ = 231244608. Its totient is φ = 231181860.

The previous prime is 231213217. The next prime is 231213247. The reversal of 231213233 is 332312132.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231213233 - 2⁴ = 231213217 is a prime.

It is a super-2 number, since 2×231213233² = 106919118228624578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231213833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060 + ... + 21602.

It is an arithmetic number, because the mean of its divisors is an integer number (57811152).

Almost surely, 2^231213233 is an apocalyptic number.

It is an amenable number.

231213233 is a deficient number, since it is larger than the sum of its proper divisors (31375).

231213233 is a wasteful number, since it uses less digits than its factorization.

231213233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31374.

The product of its digits is 648, while the sum is 20.

The square root of 231213233 is about 15205.6973861773. The cubic root of 231213233 is about 613.7679814931.

Adding to 231213233 its reverse (332312132), we get a palindrome (563525365).

The spelling of 231213233 in words is "two hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-three".