621941 has 2 divisors, whose sum is σ = 621942. Its totient is φ = 621940.

The previous prime is 621937. The next prime is 621983. The reversal of 621941 is 149126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600625 + 21316 = 775^2 + 146^2 .

It is a cyclic number.

It is not a de Polignac number, because 621941 - 2² = 621937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621241) 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, 310970 + 310971.

It is an arithmetic number, because the mean of its divisors is an integer number (310971).

2⁶²¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

621941 is a deficient number, since it is larger than the sum of its proper divisors (1).

621941 is an equidigital number, since it uses as much as digits as its factorization.

621941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 621941 is about 788.6323604824. The cubic root of 621941 is about 85.3590807044.

The spelling of 621941 in words is "six hundred twenty-one thousand, nine hundred forty-one".