1232123231 has 2 divisors, whose sum is σ = 1232123232. Its totient is φ = 1232123230.

The previous prime is 1232123227. The next prime is 1232123239. The reversal of 1232123231 is 1323212321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1232123231 - 2² = 1232123227 is a prime.

It is a super-2 number, since 2×1232123231² = 3036255312739758722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232123239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616061615 + 616061616.

It is an arithmetic number, because the mean of its divisors is an integer number (616061616).

Almost surely, 2^1232123231 is an apocalyptic number.

1232123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232123231 is an equidigital number, since it uses as much as digits as its factorization.

1232123231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 1232123231 is about 35101.6129401485. The cubic root of 1232123231 is about 1072.0574240490.

Adding to 1232123231 its reverse (1323212321), we get a palindrome (2555335552).

The spelling of 1232123231 in words is "one billion, two hundred thirty-two million, one hundred twenty-three thousand, two hundred thirty-one".