816618113 has 2 divisors, whose sum is σ = 816618114. Its totient is φ = 816618112.

The previous prime is 816618109. The next prime is 816618161. The reversal of 816618113 is 311816618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657050689 + 159567424 = 25633^2 + 12632^2 .

It is a cyclic number.

It is not a de Polignac number, because 816618113 - 2² = 816618109 is a prime.

It is not a weakly prime, because it can be changed into another prime (816648113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408309056 + 408309057.

It is an arithmetic number, because the mean of its divisors is an integer number (408309057).

Almost surely, 2^816618113 is an apocalyptic number.

It is an amenable number.

816618113 is a deficient number, since it is larger than the sum of its proper divisors (1).

816618113 is an equidigital number, since it uses as much as digits as its factorization.

816618113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 816618113 is about 28576.5308076400. The cubic root of 816618113 is about 934.7016360481.

The spelling of 816618113 in words is "eight hundred sixteen million, six hundred eighteen thousand, one hundred thirteen".