12920129 has 4 divisors (see below), whose sum is σ = 12927684. Its totient is φ = 12912576.

The previous prime is 12920093. The next prime is 12920177. The reversal of 12920129 is 92102921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92102921 = 449 ⋅205129.

It can be written as a sum of positive squares in 2 ways, for example, as 9909904 + 3010225 = 3148^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 12920129 - 2¹⁶ = 12854593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12920098 and 12920107.

It is not an unprimeable number, because it can be changed into a prime (12920429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149 + ... + 5085.

It is an arithmetic number, because the mean of its divisors is an integer number (3231921).

Almost surely, 2^12920129 is an apocalyptic number.

It is an amenable number.

12920129 is a deficient number, since it is larger than the sum of its proper divisors (7555).

12920129 is an equidigital number, since it uses as much as digits as its factorization.

12920129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7554.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 12920129 is about 3594.4580954575. The cubic root of 12920129 is about 234.6509318805.

The spelling of 12920129 in words is "twelve million, nine hundred twenty thousand, one hundred twenty-nine".