816091 has 2 divisors, whose sum is σ = 816092. Its totient is φ = 816090.

The previous prime is 816077. The next prime is 816103. The reversal of 816091 is 190618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816091 - 2⁷ = 815963 is a prime.

816091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (816191) 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 as a sum of consecutive naturals, namely, 408045 + 408046.

It is an arithmetic number, because the mean of its divisors is an integer number (408046).

2⁸¹⁶⁰⁹¹ is an apocalyptic number.

816091 is a deficient number, since it is larger than the sum of its proper divisors (1).

816091 is an equidigital number, since it uses as much as digits as its factorization.

816091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 816091 is about 903.3775511933. The cubic root of 816091 is about 93.4500481464.

The spelling of 816091 in words is "eight hundred sixteen thousand, ninety-one".