641295209 has 2 divisors, whose sum is σ = 641295210. Its totient is φ = 641295208.

The previous prime is 641295167. The next prime is 641295311. The reversal of 641295209 is 902592146.

641295209 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., 382085209 + 259210000 = 19547^2 + 16100^2 .

It is a cyclic number.

It is not a de Polignac number, because 641295209 - 2¹² = 641291113 is a prime.

It is a super-2 number, since 2×641295209² = 822519090172707362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641295409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320647604 + 320647605.

It is an arithmetic number, because the mean of its divisors is an integer number (320647605).

Almost surely, 2^641295209 is an apocalyptic number.

It is an amenable number.

641295209 is a deficient number, since it is larger than the sum of its proper divisors (1).

641295209 is an equidigital number, since it uses as much as digits as its factorization.

641295209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 641295209 is about 25323.8071584823. The cubic root of 641295209 is about 862.3548266199.

The spelling of 641295209 in words is "six hundred forty-one million, two hundred ninety-five thousand, two hundred nine".