63416821 has 4 divisors (see below), whose sum is σ = 68295052. Its totient is φ = 58538592.

The previous prime is 63416809. The next prime is 63416831. The reversal of 63416821 is 12861436.

It is a happy number.

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 25150225 + 38266596 = 5015^2 + 6186^2 .

It is a cyclic number.

It is not a de Polignac number, because 63416821 - 2¹¹ = 63414773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63416831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2439096 + ... + 2439121.

It is an arithmetic number, because the mean of its divisors is an integer number (17073763).

Almost surely, 2^63416821 is an apocalyptic number.

It is an amenable number.

63416821 is a deficient number, since it is larger than the sum of its proper divisors (4878231).

63416821 is a wasteful number, since it uses less digits than its factorization.

63416821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878230.

The product of its digits is 6912, while the sum is 31.

The square root of 63416821 is about 7963.4679003560. The cubic root of 63416821 is about 398.7813346576.

The spelling of 63416821 in words is "sixty-three million, four hundred sixteen thousand, eight hundred twenty-one".