641512217 has 2 divisors, whose sum is σ = 641512218. Its totient is φ = 641512216.

The previous prime is 641512213. The next prime is 641512231. The reversal of 641512217 is 712215146.

641512217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588353536 + 53158681 = 24256^2 + 7291^2 .

It is a cyclic number.

It is not a de Polignac number, because 641512217 - 2² = 641512213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641512217.

It is not a weakly prime, because it can be changed into another prime (641512211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320756108 + 320756109.

It is an arithmetic number, because the mean of its divisors is an integer number (320756109).

Almost surely, 2^641512217 is an apocalyptic number.

It is an amenable number.

641512217 is a deficient number, since it is larger than the sum of its proper divisors (1).

641512217 is an equidigital number, since it uses as much as digits as its factorization.

641512217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 641512217 is about 25328.0914598791. The cubic root of 641512217 is about 862.4520864513.

The spelling of 641512217 in words is "six hundred forty-one million, five hundred twelve thousand, two hundred seventeen".