123311129 has 2 divisors, whose sum is σ = 123311130. Its totient is φ = 123311128.

The previous prime is 123311117. The next prime is 123311141. The reversal of 123311129 is 921113321.

It is a balanced prime because it is at equal distance from previous prime (123311117) and next prime (123311141).

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 21603904 = 10085^2 + 4648^2 .

It is an emirp because it is prime and its reverse (921113321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123311129 - 2¹² = 123307033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123311429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61655564 + 61655565.

It is an arithmetic number, because the mean of its divisors is an integer number (61655565).

Almost surely, 2^123311129 is an apocalyptic number.

It is an amenable number.

123311129 is a deficient number, since it is larger than the sum of its proper divisors (1).

123311129 is an equidigital number, since it uses as much as digits as its factorization.

123311129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 123311129 is about 11104.5544260002. The cubic root of 123311129 is about 497.7379537261.

The spelling of 123311129 in words is "one hundred twenty-three million, three hundred eleven thousand, one hundred twenty-nine".