816034993 has 2 divisors, whose sum is σ = 816034994. Its totient is φ = 816034992.

The previous prime is 816034991. The next prime is 816034997. The reversal of 816034993 is 399430618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562970529 + 253064464 = 23727^2 + 15908^2 .

It is a cyclic number.

It is not a de Polignac number, because 816034993 - 2¹ = 816034991 is a prime.

Together with 816034991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (816034991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408017496 + 408017497.

It is an arithmetic number, because the mean of its divisors is an integer number (408017497).

Almost surely, 2^816034993 is an apocalyptic number.

It is an amenable number.

816034993 is a deficient number, since it is larger than the sum of its proper divisors (1).

816034993 is an equidigital number, since it uses as much as digits as its factorization.

816034993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 816034993 is about 28566.3262076172. The cubic root of 816034993 is about 934.4791032251.

The spelling of 816034993 in words is "eight hundred sixteen million, thirty-four thousand, nine hundred ninety-three".