123755129 has 2 divisors, whose sum is σ = 123755130. Its totient is φ = 123755128.

The previous prime is 123755119. The next prime is 123755147. The reversal of 123755129 is 921557321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109767529 + 13987600 = 10477^2 + 3740^2 .

It is an emirp because it is prime and its reverse (921557321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123755129 - 2¹⁶ = 123689593 is a prime.

It is not a weakly prime, because it can be changed into another prime (123755119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61877564 + 61877565.

It is an arithmetic number, because the mean of its divisors is an integer number (61877565).

Almost surely, 2^123755129 is an apocalyptic number.

It is an amenable number.

123755129 is a deficient number, since it is larger than the sum of its proper divisors (1).

123755129 is an equidigital number, since it uses as much as digits as its factorization.

123755129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 123755129 is about 11124.5282596612. The cubic root of 123755129 is about 498.3346312523.

The spelling of 123755129 in words is "one hundred twenty-three million, seven hundred fifty-five thousand, one hundred twenty-nine".