816716491 has 4 divisors (see below), whose sum is σ = 817344592. Its totient is φ = 816088392.

The previous prime is 816716471. The next prime is 816716609. The reversal of 816716491 is 194617618.

816716491 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.

It is a cyclic number.

It is not a de Polignac number, because 816716491 - 2²⁵ = 783162059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816716471) 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, 312096 + ... + 314701.

It is an arithmetic number, because the mean of its divisors is an integer number (204336148).

Almost surely, 2^816716491 is an apocalyptic number.

816716491 is a deficient number, since it is larger than the sum of its proper divisors (628101).

816716491 is a wasteful number, since it uses less digits than its factorization.

816716491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628100.

The product of its digits is 72576, while the sum is 43.

The square root of 816716491 is about 28578.2520634135. The cubic root of 816716491 is about 934.7391690491.

The spelling of 816716491 in words is "eight hundred sixteen million, seven hundred sixteen thousand, four hundred ninety-one".