123443129 has 2 divisors, whose sum is σ = 123443130. Its totient is φ = 123443128.

The previous prime is 123443123. The next prime is 123443143. The reversal of 123443129 is 921344321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107081104 + 16362025 = 10348^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 123443129 - 2⁴ = 123443113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (123443123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61721564 + 61721565.

It is an arithmetic number, because the mean of its divisors is an integer number (61721565).

Almost surely, 2^123443129 is an apocalyptic number.

It is an amenable number.

123443129 is a deficient number, since it is larger than the sum of its proper divisors (1).

123443129 is an equidigital number, since it uses as much as digits as its factorization.

123443129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 123443129 is about 11110.4963435483. The cubic root of 123443129 is about 497.9154937440.

It can be divided in two parts, 12344312 and 9, that added together give a palindrome (12344321).

The spelling of 123443129 in words is "one hundred twenty-three million, four hundred forty-three thousand, one hundred twenty-nine".