646099 has 2 divisors, whose sum is σ = 646100. Its totient is φ = 646098.

The previous prime is 646073. The next prime is 646103. The reversal of 646099 is 990646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646099 - 2⁵ = 646067 is a prime.

646099 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (646039) 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, 323049 + 323050.

It is an arithmetic number, because the mean of its divisors is an integer number (323050).

2⁶⁴⁶⁰⁹⁹ is an apocalyptic number.

646099 is a deficient number, since it is larger than the sum of its proper divisors (1).

646099 is an equidigital number, since it uses as much as digits as its factorization.

646099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 646099 is about 803.8028365215. The cubic root of 646099 is about 86.4502704566.

The spelling of 646099 in words is "six hundred forty-six thousand, ninety-nine".