12129231 has 8 divisors (see below), whose sum is σ = 16190640. Its totient is φ = 8076992.

The previous prime is 12129217. The next prime is 12129233. The reversal of 12129231 is 13292121.

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

It is a cyclic number.

It is not a de Polignac number, because 12129231 - 2⁶ = 12129167 is a prime.

It is a super-2 number, since 2×12129231² = 294236489302722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12129198 and 12129207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129233) 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, 1885 + ... + 5273.

It is an arithmetic number, because the mean of its divisors is an integer number (2023830).

Almost surely, 2^12129231 is an apocalyptic number.

12129231 is a deficient number, since it is larger than the sum of its proper divisors (4061409).

12129231 is a wasteful number, since it uses less digits than its factorization.

12129231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585.

The product of its digits is 216, while the sum is 21.

The square root of 12129231 is about 3482.7045524994. The cubic root of 12129231 is about 229.7617633990.

The spelling of 12129231 in words is "twelve million, one hundred twenty-nine thousand, two hundred thirty-one".