231223133 has 2 divisors, whose sum is σ = 231223134. Its totient is φ = 231223132.

The previous prime is 231223121. The next prime is 231223147. The reversal of 231223133 is 331322132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190798969 + 40424164 = 13813^2 + 6358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231223133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231223933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115611566 + 115611567.

It is an arithmetic number, because the mean of its divisors is an integer number (115611567).

Almost surely, 2^231223133 is an apocalyptic number.

It is an amenable number.

231223133 is a deficient number, since it is larger than the sum of its proper divisors (1).

231223133 is an equidigital number, since it uses as much as digits as its factorization.

231223133 is an evil number, because the sum of its binary digits is even.

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

The square root of 231223133 is about 15206.0229185675. The cubic root of 231223133 is about 613.7767413958.

Adding to 231223133 its reverse (331322132), we get a palindrome (562545265).

The spelling of 231223133 in words is "two hundred thirty-one million, two hundred twenty-three thousand, one hundred thirty-three".