12123731 has 2 divisors, whose sum is σ = 12123732. Its totient is φ = 12123730.

The previous prime is 12123701. The next prime is 12123751. The reversal of 12123731 is 13732121.

It is an a-pointer prime, because the next prime (12123751) can be obtained adding 12123731 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12123731 is a prime.

It is a super-2 number, since 2×12123731² = 293969706720722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12123701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061865 + 6061866.

It is an arithmetic number, because the mean of its divisors is an integer number (6061866).

Almost surely, 2^12123731 is an apocalyptic number.

12123731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123731 is an equidigital number, since it uses as much as digits as its factorization.

12123731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 12123731 is about 3481.9148467474. The cubic root of 12123731 is about 229.7270296566.

Adding to 12123731 its reverse (13732121), we get a palindrome (25855852).

The spelling of 12123731 in words is "twelve million, one hundred twenty-three thousand, seven hundred thirty-one".