12013579729 has 4 divisors (see below), whose sum is σ = 12020652400. Its totient is φ = 12006507060.

The previous prime is 12013579727. The next prime is 12013579733. The reversal of 12013579729 is 92797531021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92797531021 = 13 ⋅7138271617.

It is a cyclic number.

It is not a de Polignac number, because 12013579729 - 2¹ = 12013579727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12013579723) 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, 3533787 + ... + 3537184.

It is an arithmetic number, because the mean of its divisors is an integer number (3005163100).

Almost surely, 2^12013579729 is an apocalyptic number.

It is an amenable number.

12013579729 is a deficient number, since it is larger than the sum of its proper divisors (7072671).

12013579729 is an equidigital number, since it uses as much as digits as its factorization.

12013579729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072670.

The product of its (nonzero) digits is 238140, while the sum is 46.

The spelling of 12013579729 in words is "twelve billion, thirteen million, five hundred seventy-nine thousand, seven hundred twenty-nine".