12129361 has 4 divisors (see below), whose sum is σ = 12136500. Its totient is φ = 12122224.

The previous prime is 12129343. The next prime is 12129379. The reversal of 12129361 is 16392121.

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: 16392121 = 1759 ⋅9319.

It is an interprime number because it is at equal distance from previous prime (12129343) and next prime (12129379).

It can be written as a sum of positive squares in 2 ways, for example, as 3129361 + 9000000 = 1769^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12129361 - 2⁷ = 12129233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12129661) 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, 615 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (3034125).

Almost surely, 2^12129361 is an apocalyptic number.

It is an amenable number.

12129361 is a deficient number, since it is larger than the sum of its proper divisors (7139).

12129361 is an equidigital number, since it uses as much as digits as its factorization.

12129361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138.

The product of its digits is 648, while the sum is 25.

The square root of 12129361 is about 3482.7232161055. The cubic root of 12129361 is about 229.7625842513.

The spelling of 12129361 in words is "twelve million, one hundred twenty-nine thousand, three hundred sixty-one".