63441721 has 6 divisors (see below), whose sum is σ = 73799610. Its totient is φ = 54378576.

The previous prime is 63441713. The next prime is 63441737. The reversal of 63441721 is 12714436.

It can be written as a sum of positive squares in only one way, i.e., 48511225 + 14930496 = 6965^2 + 3864^2 .

It is not a de Polignac number, because 63441721 - 2³ = 63441713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63441721.

It is not an unprimeable number, because it can be changed into a prime (63441701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 647316 + ... + 647413.

It is an arithmetic number, because the mean of its divisors is an integer number (12299935).

Almost surely, 2^63441721 is an apocalyptic number.

It is an amenable number.

63441721 is a deficient number, since it is larger than the sum of its proper divisors (10357889).

63441721 is a wasteful number, since it uses less digits than its factorization.

63441721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294743 (or 1294736 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 63441721 is about 7965.0311361601. The cubic root of 63441721 is about 398.8335203698.

The spelling of 63441721 in words is "sixty-three million, four hundred forty-one thousand, seven hundred twenty-one".