816532613 has 16 divisors (see below), whose sum is σ = 934266480. Its totient is φ = 708051456.

The previous prime is 816532601. The next prime is 816532643. The reversal of 816532613 is 316235618.

It can be written as a sum of positive squares in 8 ways, for example, as 744769 + 815787844 = 863^2 + 28562^2 .

It is a cyclic number.

It is not a de Polignac number, because 816532613 - 2⁸ = 816532357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816532643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15320 + ... + 43217.

It is an arithmetic number, because the mean of its divisors is an integer number (58391655).

Almost surely, 2^816532613 is an apocalyptic number.

It is an amenable number.

816532613 is a deficient number, since it is larger than the sum of its proper divisors (117733867).

816532613 is a wasteful number, since it uses less digits than its factorization.

816532613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58616.

The product of its digits is 25920, while the sum is 35.

The square root of 816532613 is about 28575.0347856306. The cubic root of 816532613 is about 934.6690137906.

The spelling of 816532613 in words is "eight hundred sixteen million, five hundred thirty-two thousand, six hundred thirteen".