123129992929 has 2 divisors, whose sum is σ = 123129992930. Its totient is φ = 123129992928.

The previous prime is 123129992927. The next prime is 123129992933. The reversal of 123129992929 is 929299921321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79325595904 + 43804397025 = 281648^2 + 209295^2 .

It is an emirp because it is prime and its reverse (929299921321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123129992929 - 2¹ = 123129992927 is a prime.

Together with 123129992927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123129992927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61564996464 + 61564996465.

It is an arithmetic number, because the mean of its divisors is an integer number (61564996465).

Almost surely, 2^123129992929 is an apocalyptic number.

It is an amenable number.

123129992929 is a deficient number, since it is larger than the sum of its proper divisors (1).

123129992929 is an equidigital number, since it uses as much as digits as its factorization.

123129992929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 58.

The spelling of 123129992929 in words is "one hundred twenty-three billion, one hundred twenty-nine million, nine hundred ninety-two thousand, nine hundred twenty-nine".