8231216513 has 4 divisors (see below), whose sum is σ = 8864387028. Its totient is φ = 7598046000.

The previous prime is 8231216509. The next prime is 8231216527. The reversal of 8231216513 is 3156121328.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2185843009 + 6045373504 = 46753^2 + 77752^2 .

It is a cyclic number.

It is not a de Polignac number, because 8231216513 - 2² = 8231216509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8231216513.

It is not an unprimeable number, because it can be changed into a prime (8231216573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316585238 + ... + 316585263.

It is an arithmetic number, because the mean of its divisors is an integer number (2216096757).

Almost surely, 2^8231216513 is an apocalyptic number.

It is an amenable number.

8231216513 is a deficient number, since it is larger than the sum of its proper divisors (633170515).

8231216513 is a wasteful number, since it uses less digits than its factorization.

8231216513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633170514.

The product of its digits is 8640, while the sum is 32.

The square root of 8231216513 is about 90726.0520082297. The cubic root of 8231216513 is about 2019.0853383601.

The spelling of 8231216513 in words is "eight billion, two hundred thirty-one million, two hundred sixteen thousand, five hundred thirteen".