12808127929 has 3 divisors (see below), whose sum is σ = 12808241103. Its totient is φ = 12808014756.

The previous prime is 12808127881. The next prime is 12808127951. The reversal of 12808127929 is 92972180821.

The square root of 12808127929 is 113173.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3999930025 + 8808197904 = 63245^2 + 93852^2 .

It is not a de Polignac number, because 12808127929 - 2⁹ = 12808127417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12808124929) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56587 + ... + 169759.

It is an arithmetic number, because the mean of its divisors is an integer number (4269413701).

Almost surely, 2^12808127929 is an apocalyptic number.

12808127929 is the 113173-rd square number.

12808127929 is the 56587-th centered octagonal number.

It is an amenable number.

12808127929 is a deficient number, since it is larger than the sum of its proper divisors (113174).

12808127929 is an frugal number, since it uses more digits than its factorization.

12808127929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226346 (or 113173 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

Multiplying 12808127929 by its sum of digits (49), we get a square (627598268521 = 792211²).

The spelling of 12808127929 in words is "twelve billion, eight hundred eight million, one hundred twenty-seven thousand, nine hundred twenty-nine".