816626513 has 2 divisors, whose sum is σ = 816626514. Its totient is φ = 816626512.

The previous prime is 816626507. The next prime is 816626537. The reversal of 816626513 is 315626618.

816626513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744580369 + 72046144 = 27287^2 + 8488^2 .

It is a cyclic number.

It is not a de Polignac number, because 816626513 - 2¹⁰ = 816625489 is a prime.

It is not a weakly prime, because it can be changed into another prime (816626543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408313256 + 408313257.

It is an arithmetic number, because the mean of its divisors is an integer number (408313257).

Almost surely, 2^816626513 is an apocalyptic number.

It is an amenable number.

816626513 is a deficient number, since it is larger than the sum of its proper divisors (1).

816626513 is an equidigital number, since it uses as much as digits as its factorization.

816626513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 816626513 is about 28576.6777810158. The cubic root of 816626513 is about 934.7048409190.

The spelling of 816626513 in words is "eight hundred sixteen million, six hundred twenty-six thousand, five hundred thirteen".