123121329 has 8 divisors (see below), whose sum is σ = 164356320. Its totient is φ = 81983616.

The previous prime is 123121309. The next prime is 123121333. The reversal of 123121329 is 923121321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123121329 - 2¹¹ = 123119281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123121299 and 123121308.

It is not an unprimeable number, because it can be changed into a prime (123121309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21312 + ... + 26465.

It is an arithmetic number, because the mean of its divisors is an integer number (20544540).

Almost surely, 2^123121329 is an apocalyptic number.

It is an amenable number.

123121329 is a deficient number, since it is larger than the sum of its proper divisors (41234991).

123121329 is an equidigital number, since it uses as much as digits as its factorization.

123121329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48639.

The product of its digits is 648, while the sum is 24.

The square root of 123121329 is about 11096.0050919238. The cubic root of 123121329 is about 497.4824504975.

The spelling of 123121329 in words is "one hundred twenty-three million, one hundred twenty-one thousand, three hundred twenty-nine".