12731089 has 4 divisors (see below), whose sum is σ = 14549824. Its totient is φ = 10912356.

The previous prime is 12731063. The next prime is 12731093. The reversal of 12731089 is 98013721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12731089 - 2¹⁵ = 12698321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12731089.

It is not an unprimeable number, because it can be changed into a prime (12731039) 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, 909357 + ... + 909370.

It is an arithmetic number, because the mean of its divisors is an integer number (3637456).

Almost surely, 2^12731089 is an apocalyptic number.

It is an amenable number.

12731089 is a deficient number, since it is larger than the sum of its proper divisors (1818735).

12731089 is an equidigital number, since it uses as much as digits as its factorization.

12731089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818734.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12731089 is about 3568.0651619610. The cubic root of 12731089 is about 233.5008780786.

The spelling of 12731089 in words is "twelve million, seven hundred thirty-one thousand, eighty-nine".