649799 has 2 divisors, whose sum is σ = 649800. Its totient is φ = 649798.

The previous prime is 649793. The next prime is 649801. The reversal of 649799 is 997946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649799 - 2⁴ = 649783 is a prime.

Together with 649801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324899 + 324900.

It is an arithmetic number, because the mean of its divisors is an integer number (324900).

2⁶⁴⁹⁷⁹⁹ is an apocalyptic number.

649799 is a deficient number, since it is larger than the sum of its proper divisors (1).

649799 is an equidigital number, since it uses as much as digits as its factorization.

649799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 649799 is about 806.1011102833. The cubic root of 649799 is about 86.6149806874.

The spelling of 649799 in words is "six hundred forty-nine thousand, seven hundred ninety-nine".