63221761 has 4 divisors (see below), whose sum is σ = 63240772. Its totient is φ = 63202752.

The previous prime is 63221731. The next prime is 63221813. The reversal of 63221761 is 16712236.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40564161 + 22657600 = 6369^2 + 4760^2 .

It is a cyclic number.

It is not a de Polignac number, because 63221761 - 2²³ = 54833153 is a prime.

It is a super-2 number, since 2×63221761² = 7993982127882242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63221701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3060 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (15810193).

Almost surely, 2^63221761 is an apocalyptic number.

It is an amenable number.

63221761 is a deficient number, since it is larger than the sum of its proper divisors (19011).

63221761 is a wasteful number, since it uses less digits than its factorization.

63221761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19010.

The product of its digits is 3024, while the sum is 28.

The square root of 63221761 is about 7951.2112913694. The cubic root of 63221761 is about 398.3720522033.

Adding to 63221761 its reverse (16712236), we get a palindrome (79933997).

The spelling of 63221761 in words is "sixty-three million, two hundred twenty-one thousand, seven hundred sixty-one".