12129013 has 4 divisors (see below), whose sum is σ = 13062028. Its totient is φ = 11196000.

The previous prime is 12128969. The next prime is 12129017. The reversal of 12129013 is 31092121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31092121 = 179 ⋅173699.

It can be written as a sum of positive squares in 2 ways, for example, as 6185169 + 5943844 = 2487^2 + 2438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12129013 is a prime.

It is a super-2 number, since 2×12129013² = 294225912708338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129017) 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, 466488 + ... + 466513.

It is an arithmetic number, because the mean of its divisors is an integer number (3265507).

Almost surely, 2^12129013 is an apocalyptic number.

12129013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12129013 is a deficient number, since it is larger than the sum of its proper divisors (933015).

12129013 is an equidigital number, since it uses as much as digits as its factorization.

12129013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933014.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 12129013 is about 3482.6732548432. The cubic root of 12129013 is about 229.7603868796.

The spelling of 12129013 in words is "twelve million, one hundred twenty-nine thousand, thirteen".