12134729581 has 4 divisors (see below), whose sum is σ = 13068170332. Its totient is φ = 11201288832.

The previous prime is 12134729569. The next prime is 12134729587. The reversal of 12134729581 is 18592743121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4265265481 + 7869464100 = 65309^2 + 88710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12134729581 is a prime.

It is a super-2 number, since 2×12134729581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12134729587) 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, 466720356 + ... + 466720381.

It is an arithmetic number, because the mean of its divisors is an integer number (3267042583).

Almost surely, 2^12134729581 is an apocalyptic number.

It is an amenable number.

12134729581 is a deficient number, since it is larger than the sum of its proper divisors (933440751).

12134729581 is an equidigital number, since it uses as much as digits as its factorization.

12134729581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933440750.

The product of its digits is 120960, while the sum is 43.

The spelling of 12134729581 in words is "twelve billion, one hundred thirty-four million, seven hundred twenty-nine thousand, five hundred eighty-one".