12129731 has 2 divisors, whose sum is σ = 12129732. Its totient is φ = 12129730.

The previous prime is 12129707. The next prime is 12129737. The reversal of 12129731 is 13792121.

12129731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12129731 - 2¹⁴ = 12113347 is a prime.

It is a super-2 number, since 2×12129731² = 294260748264722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12129731.

It is not a weakly prime, because it can be changed into another prime (12129737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064865 + 6064866.

It is an arithmetic number, because the mean of its divisors is an integer number (6064866).

Almost surely, 2^12129731 is an apocalyptic number.

12129731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12129731 is an equidigital number, since it uses as much as digits as its factorization.

12129731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 26.

The square root of 12129731 is about 3482.7763350523. The cubic root of 12129731 is about 229.7649204912.

The spelling of 12129731 in words is "twelve million, one hundred twenty-nine thousand, seven hundred thirty-one".