12876121729 has 9 divisors (see below), whose sum is σ = 13129783849. Its totient is φ = 12627275440.

The previous prime is 12876121721. The next prime is 12876121733. The reversal of 12876121729 is 92712167821.

The square root of 12876121729 is 113473.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 6595876225 + 6280245504 = 81215^2 + 79248^2 .

It is not a de Polignac number, because 12876121729 - 2³ = 12876121721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12876121721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6012999 + ... + 6015139.

Almost surely, 2^12876121729 is an apocalyptic number.

12876121729 is the 113473-rd square number.

12876121729 is the 56737-th centered octagonal number.

It is an amenable number.

12876121729 is a deficient number, since it is larger than the sum of its proper divisors (253662120).

12876121729 is an frugal number, since it uses more digits than its factorization.

12876121729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388 (or 2194 counting only the distinct ones).

The product of its digits is 169344, while the sum is 46.

The spelling of 12876121729 in words is "twelve billion, eight hundred seventy-six million, one hundred twenty-one thousand, seven hundred twenty-nine".