63861 has 8 divisors (see below), whose sum is σ = 97344. Its totient is φ = 36480.

The previous prime is 63857. The next prime is 63863. The reversal of 63861 is 16836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63861 - 2² = 63857 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1500 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (12168).

2⁶³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

63861 is a deficient number, since it is larger than the sum of its proper divisors (33483).

63861 is a wasteful number, since it uses less digits than its factorization.

63861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3051.

The product of its digits is 864, while the sum is 24.

The square root of 63861 is about 252.7073406136. The cubic root of 63861 is about 39.9710206767.

The spelling of 63861 in words is "sixty-three thousand, eight hundred sixty-one".