806991398929 has 3 divisors (see below), whose sum is σ = 806992297257. Its totient is φ = 806990500602.

The previous prime is 806991398923. The next prime is 806991398957. The reversal of 806991398929 is 929893199608.

The square root of 806991398929 is 898327.

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

806991398929 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 is not a de Polignac number, because 806991398929 - 2⁵ = 806991398897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806991398923) 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, 449164 + ... + 1347490.

It is an arithmetic number, because the mean of its divisors is an integer number (268997432419).

Almost surely, 2^806991398929 is an apocalyptic number.

806991398929 is the 898327-th square number.

806991398929 is the 449164-th centered octagonal number.

It is an amenable number.

806991398929 is a deficient number, since it is larger than the sum of its proper divisors (898328).

806991398929 is an frugal number, since it uses more digits than its factorization.

806991398929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796654 (or 898327 counting only the distinct ones).

The product of its (nonzero) digits is 136048896, while the sum is 73.

The spelling of 806991398929 in words is "eight hundred six billion, nine hundred ninety-one million, three hundred ninety-eight thousand, nine hundred twenty-nine".