12122731 has 4 divisors (see below), whose sum is σ = 12268872. Its totient is φ = 11976592.

The previous prime is 12122723. The next prime is 12122807. The reversal of 12122731 is 13722121.

12122731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13722121 = 7 ⋅1960303.

It is a cyclic number.

It is not a de Polignac number, because 12122731 - 2³ = 12122723 is a prime.

It is a super-2 number, since 2×12122731² = 293921213796722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122699 and 12122708.

It is not an unprimeable number, because it can be changed into a prime (12123731) 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, 72946 + ... + 73111.

It is an arithmetic number, because the mean of its divisors is an integer number (3067218).

Almost surely, 2^12122731 is an apocalyptic number.

12122731 is a deficient number, since it is larger than the sum of its proper divisors (146141).

12122731 is an equidigital number, since it uses as much as digits as its factorization.

12122731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146140.

The product of its digits is 168, while the sum is 19.

The square root of 12122731 is about 3481.7712446397. The cubic root of 12122731 is about 229.7207133022.

Adding to 12122731 its reverse (13722121), we get a palindrome (25844852).

The spelling of 12122731 in words is "twelve million, one hundred twenty-two thousand, seven hundred thirty-one".