816510241 has 4 divisors (see below), whose sum is σ = 816597184. Its totient is φ = 816423300.

The previous prime is 816510217. The next prime is 816510251. The reversal of 816510241 is 142015618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 142015618 = 2 ⋅71007809.

It is a cyclic number.

It is not a de Polignac number, because 816510241 - 2⁷ = 816510113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816510251) 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, 27405 + ... + 48826.

It is an arithmetic number, because the mean of its divisors is an integer number (204149296).

Almost surely, 2^816510241 is an apocalyptic number.

It is an amenable number.

816510241 is a deficient number, since it is larger than the sum of its proper divisors (86943).

816510241 is a wasteful number, since it uses less digits than its factorization.

816510241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86942.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 816510241 is about 28574.6433223584. The cubic root of 816510241 is about 934.6604774481.

Adding to 816510241 its reverse (142015618), we get a palindrome (958525859).

The spelling of 816510241 in words is "eight hundred sixteen million, five hundred ten thousand, two hundred forty-one".