641923 has 2 divisors, whose sum is σ = 641924. Its totient is φ = 641922.

The previous prime is 641909. The next prime is 641929. The reversal of 641923 is 329146.

641923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641923 - 2⁵ = 641891 is a prime.

It is not a weakly prime, because it can be changed into another prime (641929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320961 + 320962.

It is an arithmetic number, because the mean of its divisors is an integer number (320962).

2⁶⁴¹⁹²³ is an apocalyptic number.

641923 is a deficient number, since it is larger than the sum of its proper divisors (1).

641923 is an equidigital number, since it uses as much as digits as its factorization.

641923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 641923 is about 801.2009735391. The cubic root of 641923 is about 86.2636133382.

The spelling of 641923 in words is "six hundred forty-one thousand, nine hundred twenty-three".