63881 has 4 divisors (see below), whose sum is σ = 64512. Its totient is φ = 63252.

The previous prime is 63863. The next prime is 63901. The reversal of 63881 is 18836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 63881 - 2¹⁴ = 47497 is a prime.

It is a super-3 number, since 3×63881³ = 782053335680523, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63881.

It is not an unprimeable number, because it can be changed into a prime (63841) 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, 125 + ... + 378.

It is an arithmetic number, because the mean of its divisors is an integer number (16128).

2⁶³⁸⁸¹ is an apocalyptic number.

It is an amenable number.

63881 is a deficient number, since it is larger than the sum of its proper divisors (631).

63881 is a wasteful number, since it uses less digits than its factorization.

63881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its digits is 1152, while the sum is 26.

The square root of 63881 is about 252.7469089821. The cubic root of 63881 is about 39.9751929518.

The spelling of 63881 in words is "sixty-three thousand, eight hundred eighty-one".