641020729 has 2 divisors, whose sum is σ = 641020730. Its totient is φ = 641020728.

The previous prime is 641020711. The next prime is 641020747. The reversal of 641020729 is 927020146.

641020729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (641020711) and next prime (641020747).

It can be written as a sum of positive squares in only one way, i.e., 494973504 + 146047225 = 22248^2 + 12085^2 .

It is a cyclic number.

It is not a de Polignac number, because 641020729 - 2¹⁷ = 640889657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641020729.

It is not a weakly prime, because it can be changed into another prime (641020769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320510364 + 320510365.

It is an arithmetic number, because the mean of its divisors is an integer number (320510365).

Almost surely, 2^641020729 is an apocalyptic number.

It is an amenable number.

641020729 is a deficient number, since it is larger than the sum of its proper divisors (1).

641020729 is an equidigital number, since it uses as much as digits as its factorization.

641020729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 641020729 is about 25318.3871721719. The cubic root of 641020729 is about 862.2317772415.

The spelling of 641020729 in words is "six hundred forty-one million, twenty thousand, seven hundred twenty-nine".