816246649 has 4 divisors (see below), whose sum is σ = 819422964. Its totient is φ = 813070336.

The previous prime is 816246637. The next prime is 816246659. The reversal of 816246649 is 946642618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946642618 = 2 ⋅473321309.

It can be written as a sum of positive squares in 2 ways, for example, as 808378624 + 7868025 = 28432^2 + 2805^2 .

It is a cyclic number.

It is not a de Polignac number, because 816246649 - 2⁷ = 816246521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816246599 and 816246608.

It is not an unprimeable number, because it can be changed into a prime (816246659) 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, 1587772 + ... + 1588285.

It is an arithmetic number, because the mean of its divisors is an integer number (204855741).

Almost surely, 2^816246649 is an apocalyptic number.

It is an amenable number.

816246649 is a deficient number, since it is larger than the sum of its proper divisors (3176315).

816246649 is a wasteful number, since it uses less digits than its factorization.

816246649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176314.

The product of its digits is 497664, while the sum is 46.

The square root of 816246649 is about 28570.0306090141. The cubic root of 816246649 is about 934.5598885726.

The spelling of 816246649 in words is "eight hundred sixteen million, two hundred forty-six thousand, six hundred forty-nine".