641604001 has 2 divisors, whose sum is σ = 641604002. Its totient is φ = 641604000.

The previous prime is 641603999. The next prime is 641604031. The reversal of 641604001 is 100406146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338008225 + 303595776 = 18385^2 + 17424^2 .

It is a cyclic number.

It is not a de Polignac number, because 641604001 - 2¹ = 641603999 is a prime.

Together with 641603999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (641604031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320802000 + 320802001.

It is an arithmetic number, because the mean of its divisors is an integer number (320802001).

Almost surely, 2^641604001 is an apocalyptic number.

It is an amenable number.

641604001 is a deficient number, since it is larger than the sum of its proper divisors (1).

641604001 is an equidigital number, since it uses as much as digits as its factorization.

641604001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 641604001 is about 25329.9032963018. The cubic root of 641604001 is about 862.4932161057.

The spelling of 641604001 in words is "six hundred forty-one million, six hundred four thousand, one".