641488123 has 2 divisors, whose sum is σ = 641488124. Its totient is φ = 641488122.

The previous prime is 641488109. The next prime is 641488151. The reversal of 641488123 is 321884146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641488123 - 2²¹ = 639390971 is a prime.

It is not a weakly prime, because it can be changed into another prime (641488163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320744061 + 320744062.

It is an arithmetic number, because the mean of its divisors is an integer number (320744062).

Almost surely, 2^641488123 is an apocalyptic number.

641488123 is a deficient number, since it is larger than the sum of its proper divisors (1).

641488123 is an equidigital number, since it uses as much as digits as its factorization.

641488123 is an odious number, because the sum of its binary digits is odd.

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

The square root of 641488123 is about 25327.6158175222. The cubic root of 641488123 is about 862.4412889532.

The spelling of 641488123 in words is "six hundred forty-one million, four hundred eighty-eight thousand, one hundred twenty-three".