641221719 has 16 divisors (see below), whose sum is σ = 891361152. Its totient is φ = 409657248.

The previous prime is 641221703. The next prime is 641221733. The reversal of 641221719 is 917122146.

It is a happy number.

It is not a de Polignac number, because 641221719 - 2⁴ = 641221703 is a prime.

It is a super-2 number, since 2×641221719² = 822330585834629922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641221719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641221769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40057 + ... + 53730.

It is an arithmetic number, because the mean of its divisors is an integer number (55710072).

Almost surely, 2^641221719 is an apocalyptic number.

641221719 is a deficient number, since it is larger than the sum of its proper divisors (250139433).

641221719 is a wasteful number, since it uses less digits than its factorization.

641221719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93886.

The product of its digits is 6048, while the sum is 33.

The square root of 641221719 is about 25322.3561107572. The cubic root of 641221719 is about 862.3218844968.

The spelling of 641221719 in words is "six hundred forty-one million, two hundred twenty-one thousand, seven hundred nineteen".