621983 has 2 divisors, whose sum is σ = 621984. Its totient is φ = 621982.

The previous prime is 621941. The next prime is 621997. The reversal of 621983 is 389126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621983 - 2¹² = 617887 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310991 + 310992.

It is an arithmetic number, because the mean of its divisors is an integer number (310992).

2⁶²¹⁹⁸³ is an apocalyptic number.

621983 is a deficient number, since it is larger than the sum of its proper divisors (1).

621983 is an equidigital number, since it uses as much as digits as its factorization.

621983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 621983 is about 788.6589884101. The cubic root of 621983 is about 85.3610021089.

The spelling of 621983 in words is "six hundred twenty-one thousand, nine hundred eighty-three".