870811847929 has 3 divisors (see below), whose sum is σ = 870812781103. Its totient is φ = 870810914756.

The previous prime is 870811847909. The next prime is 870811847947. The reversal of 870811847929 is 929748118078.

The square root of 870811847929 is 933173.

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

870811847929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 780121730025 + 90690117904 = 883245^2 + 301148^2 .

It is not a de Polignac number, because 870811847929 - 2⁵ = 870811847897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870811847909) 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, 466587 + ... + 1399759.

Almost surely, 2^870811847929 is an apocalyptic number.

870811847929 is the 933173-rd square number.

870811847929 is the 466587-th centered octagonal number.

It is an amenable number.

870811847929 is a deficient number, since it is larger than the sum of its proper divisors (933174).

870811847929 is an frugal number, since it uses more digits than its factorization.

870811847929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866346 (or 933173 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 64.

Multiplying 870811847929 by its sum of digits (64), we get a square (55731958267456 = 7465384²).

The spelling of 870811847929 in words is "eight hundred seventy billion, eight hundred eleven million, eight hundred forty-seven thousand, nine hundred twenty-nine".