126123238789 has 2 divisors, whose sum is σ = 126123238790. Its totient is φ = 126123238788.

The previous prime is 126123238757. The next prime is 126123238861. The reversal of 126123238789 is 987832321621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101389385889 + 24733852900 = 318417^2 + 157270^2 .

It is a cyclic number.

It is not a de Polignac number, because 126123238789 - 2⁵ = 126123238757 is a prime.

It is a super-2 number, since 2×126123238789² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126123238489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63061619394 + 63061619395.

It is an arithmetic number, because the mean of its divisors is an integer number (63061619395).

Almost surely, 2^126123238789 is an apocalyptic number.

It is an amenable number.

126123238789 is a deficient number, since it is larger than the sum of its proper divisors (1).

126123238789 is an equidigital number, since it uses as much as digits as its factorization.

126123238789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The spelling of 126123238789 in words is "one hundred twenty-six billion, one hundred twenty-three million, two hundred thirty-eight thousand, seven hundred eighty-nine".