12731329 has 4 divisors (see below), whose sum is σ = 13710676. Its totient is φ = 11751984.

The previous prime is 12731281. The next prime is 12731339. The reversal of 12731329 is 92313721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92313721 = 9371 ⋅9851.

It can be written as a sum of positive squares in 2 ways, for example, as 3441025 + 9290304 = 1855^2 + 3048^2 .

It is a cyclic number.

It is not a de Polignac number, because 12731329 - 2²¹ = 10634177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12731297 and 12731306.

It is not an unprimeable number, because it can be changed into a prime (12731339) 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, 489654 + ... + 489679.

It is an arithmetic number, because the mean of its divisors is an integer number (3427669).

Almost surely, 2^12731329 is an apocalyptic number.

It is an amenable number.

12731329 is a deficient number, since it is larger than the sum of its proper divisors (979347).

12731329 is an equidigital number, since it uses as much as digits as its factorization.

12731329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979346.

The product of its digits is 2268, while the sum is 28.

The square root of 12731329 is about 3568.0987934753. The cubic root of 12731329 is about 233.5023453492.

The spelling of 12731329 in words is "twelve million, seven hundred thirty-one thousand, three hundred twenty-nine".