123115129 has 2 divisors, whose sum is σ = 123115130. Its totient is φ = 123115128.

The previous prime is 123115127. The next prime is 123115147. The reversal of 123115129 is 921511321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85599504 + 37515625 = 9252^2 + 6125^2 .

It is an emirp because it is prime and its reverse (921511321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123115129 - 2¹ = 123115127 is a prime.

Together with 123115127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123115127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61557564 + 61557565.

It is an arithmetic number, because the mean of its divisors is an integer number (61557565).

Almost surely, 2^123115129 is an apocalyptic number.

It is an amenable number.

123115129 is a deficient number, since it is larger than the sum of its proper divisors (1).

123115129 is an equidigital number, since it uses as much as digits as its factorization.

123115129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 25.

The square root of 123115129 is about 11095.7257085781. The cubic root of 123115129 is about 497.4740998107.

The spelling of 123115129 in words is "one hundred twenty-three million, one hundred fifteen thousand, one hundred twenty-nine".