8119804123729 has 9 divisors (see below), whose sum is σ = 8149406751963. Its totient is φ = 8090308669752.

The previous prime is 8119804123727. The next prime is 8119804123733. The reversal of 8119804123729 is 9273214089118.

The square root of 8119804123729 is 2849527.

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

It can be written as a sum of positive squares in only one way, i.e., 2057867713729 + 6061936410000 = 1434527^2 + 2462100^2 .

It is not a de Polignac number, because 8119804123729 - 2¹ = 8119804123727 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 8119804123729.

It is not an unprimeable number, because it can be changed into a prime (8119804123727) 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, 806411107 + ... + 806421175.

It is an arithmetic number, because the mean of its divisors is an integer number (905489639107).

Almost surely, 2^{8119804123729} is an apocalyptic number.

8119804123729 is the 2849527-th square number.

8119804123729 is the 1424764-th centered octagonal number.

It is an amenable number.

8119804123729 is a deficient number, since it is larger than the sum of its proper divisors (29602628234).

8119804123729 is an frugal number, since it uses more digits than its factorization.

8119804123729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20704 (or 10352 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 8119804123729 in words is "eight trillion, one hundred nineteen billion, eight hundred four million, one hundred twenty-three thousand, seven hundred twenty-nine".