641488321 has 2 divisors, whose sum is σ = 641488322. Its totient is φ = 641488320.

The previous prime is 641488291. The next prime is 641488327. The reversal of 641488321 is 123884146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632271025 + 9217296 = 25145^2 + 3036^2 .

It is a cyclic number.

It is not a de Polignac number, because 641488321 - 2¹³ = 641480129 is a prime.

It is not a weakly prime, because it can be changed into another prime (641488327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320744160 + 320744161.

It is an arithmetic number, because the mean of its divisors is an integer number (320744161).

Almost surely, 2^641488321 is an apocalyptic number.

It is an amenable number.

641488321 is a deficient number, since it is larger than the sum of its proper divisors (1).

641488321 is an equidigital number, since it uses as much as digits as its factorization.

641488321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 37.

The square root of 641488321 is about 25327.6197262988. The cubic root of 641488321 is about 862.4413776862.

The spelling of 641488321 in words is "six hundred forty-one million, four hundred eighty-eight thousand, three hundred twenty-one".