12129791 has 4 divisors (see below), whose sum is σ = 12136800. Its totient is φ = 12122784.

The previous prime is 12129781. The next prime is 12129811. The reversal of 12129791 is 19792121.

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.

It is a cyclic number.

It is not a de Polignac number, because 12129791 - 2¹⁴ = 12113407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129701) 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, 1175 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (3034200).

Almost surely, 2^12129791 is an apocalyptic number.

12129791 is a deficient number, since it is larger than the sum of its proper divisors (7009).

12129791 is an equidigital number, since it uses as much as digits as its factorization.

12129791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008.

The product of its digits is 2268, while the sum is 32.

The square root of 12129791 is about 3482.7849488592. The cubic root of 12129791 is about 229.7652993364.

The spelling of 12129791 in words is "twelve million, one hundred twenty-nine thousand, seven hundred ninety-one".