63681771 has 4 divisors (see below), whose sum is σ = 84909032. Its totient is φ = 42454512.

The previous prime is 63681763. The next prime is 63681797. The reversal of 63681771 is 17718636.

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

It is not a de Polignac number, because 63681771 - 2³ = 63681763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63681721) 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, 10613626 + ... + 10613631.

It is an arithmetic number, because the mean of its divisors is an integer number (21227258).

Almost surely, 2^63681771 is an apocalyptic number.

63681771 is a deficient number, since it is larger than the sum of its proper divisors (21227261).

63681771 is a wasteful number, since it uses less digits than its factorization.

63681771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21227260.

The product of its digits is 42336, while the sum is 39.

The square root of 63681771 is about 7980.0859017933. The cubic root of 63681771 is about 399.3359210246.

The spelling of 63681771 in words is "sixty-three million, six hundred eighty-one thousand, seven hundred seventy-one".