123020129 has 4 divisors (see below), whose sum is σ = 123042480. Its totient is φ = 122997780.

The previous prime is 123020113. The next prime is 123020167. The reversal of 123020129 is 921020321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921020321 = 13 ⋅70847717.

It is a cyclic number.

It is not a de Polignac number, because 123020129 - 2⁴ = 123020113 is a prime.

It is a super-3 number, since 3×123020129³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 123020129.

It is not an unprimeable number, because it can be changed into a prime (123020189) 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 in 3 ways as a sum of consecutive naturals, for example, 3542 + ... + 16080.

It is an arithmetic number, because the mean of its divisors is an integer number (30760620).

Almost surely, 2^123020129 is an apocalyptic number.

It is an amenable number.

123020129 is a deficient number, since it is larger than the sum of its proper divisors (22351).

123020129 is an equidigital number, since it uses as much as digits as its factorization.

123020129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22350.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 123020129 is about 11091.4439546887. The cubic root of 123020129 is about 497.3461106650.

The spelling of 123020129 in words is "one hundred twenty-three million, twenty thousand, one hundred twenty-nine".