621799 has 2 divisors, whose sum is σ = 621800. Its totient is φ = 621798.

The previous prime is 621779. The next prime is 621821. The reversal of 621799 is 997126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621799 - 2⁷ = 621671 is a prime.

621799 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621739) 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, 310899 + 310900.

It is an arithmetic number, because the mean of its divisors is an integer number (310900).

2⁶²¹⁷⁹⁹ is an apocalyptic number.

621799 is a deficient number, since it is larger than the sum of its proper divisors (1).

621799 is an equidigital number, since it uses as much as digits as its factorization.

621799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 621799 is about 788.5423260675. The cubic root of 621799 is about 85.3525838866.

The spelling of 621799 in words is "six hundred twenty-one thousand, seven hundred ninety-nine".