641221597 has 2 divisors, whose sum is σ = 641221598. Its totient is φ = 641221596.

The previous prime is 641221583. The next prime is 641221621. The reversal of 641221597 is 795122146.

641221597 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., 619561881 + 21659716 = 24891^2 + 4654^2 .

It is a cyclic number.

It is not a de Polignac number, because 641221597 - 2¹⁵ = 641188829 is a prime.

It is a super-3 number, since 3×641221597³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641231597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320610798 + 320610799.

It is an arithmetic number, because the mean of its divisors is an integer number (320610799).

Almost surely, 2^641221597 is an apocalyptic number.

It is an amenable number.

641221597 is a deficient number, since it is larger than the sum of its proper divisors (1).

641221597 is an equidigital number, since it uses as much as digits as its factorization.

641221597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 641221597 is about 25322.3537018185. The cubic root of 641221597 is about 862.3218298078.

The spelling of 641221597 in words is "six hundred forty-one million, two hundred twenty-one thousand, five hundred ninety-seven".