641604101 has 2 divisors, whose sum is σ = 641604102. Its totient is φ = 641604100.

The previous prime is 641604077. The next prime is 641604107. The reversal of 641604101 is 101406146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445632100 + 195972001 = 21110^2 + 13999^2 .

It is a cyclic number.

It is not a de Polignac number, because 641604101 - 2⁶ = 641604037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641604107) 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, 320802050 + 320802051.

It is an arithmetic number, because the mean of its divisors is an integer number (320802051).

Almost surely, 2^641604101 is an apocalyptic number.

It is an amenable number.

641604101 is a deficient number, since it is larger than the sum of its proper divisors (1).

641604101 is an equidigital number, since it uses as much as digits as its factorization.

641604101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 641604101 is about 25329.9052702532. The cubic root of 641604101 is about 862.4932609149.

The spelling of 641604101 in words is "six hundred forty-one million, six hundred four thousand, one hundred one".