816447871 has 4 divisors (see below), whose sum is σ = 817337200. Its totient is φ = 815558544.

The previous prime is 816447839. The next prime is 816447887. The reversal of 816447871 is 178744618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816447871 - 2⁵ = 816447839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816447811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443286 + ... + 445123.

It is an arithmetic number, because the mean of its divisors is an integer number (204334300).

Almost surely, 2^816447871 is an apocalyptic number.

816447871 is a deficient number, since it is larger than the sum of its proper divisors (889329).

816447871 is an equidigital number, since it uses as much as digits as its factorization.

816447871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889328.

The product of its digits is 301056, while the sum is 46.

The square root of 816447871 is about 28573.5519493114. The cubic root of 816447871 is about 934.6366784984.

The spelling of 816447871 in words is "eight hundred sixteen million, four hundred forty-seven thousand, eight hundred seventy-one".