6851709350929 has 3 divisors (see below), whose sum is σ = 6851711968507. Its totient is φ = 6851706733352.

The previous prime is 6851709350879. The next prime is 6851709350963. The reversal of 6851709350929 is 9290539071586.

The square root of 6851709350929 is 2617577.

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., 1366970180625 + 5484739170304 = 1169175^2 + 2341952^2 .

It is not a de Polignac number, because 6851709350929 - 2²³ = 6851700962321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6851709350999) 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, 1308789 + ... + 3926365.

Almost surely, 2^{6851709350929} is an apocalyptic number.

6851709350929 is the 2617577-th square number.

6851709350929 is the 1308789-th centered octagonal number.

It is an amenable number.

6851709350929 is a deficient number, since it is larger than the sum of its proper divisors (2617578).

6851709350929 is an frugal number, since it uses more digits than its factorization.

6851709350929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5235154 (or 2617577 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 64.

Multiplying 6851709350929 by its sum of digits (64), we get a square (438509398459456 = 20940616²).

The spelling of 6851709350929 in words is "six trillion, eight hundred fifty-one billion, seven hundred nine million, three hundred fifty thousand, nine hundred twenty-nine".