83861 has 4 divisors (see below), whose sum is σ = 88812. Its totient is φ = 78912.

The previous prime is 83857. The next prime is 83869. The reversal of 83861 is 16838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16838 = 2 ⋅8419.

It can be written as a sum of positive squares in 2 ways, for example, as 46225 + 37636 = 215^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 83861 - 2² = 83857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83869) 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, 2450 + ... + 2483.

It is an arithmetic number, because the mean of its divisors is an integer number (22203).

2⁸³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

83861 is a deficient number, since it is larger than the sum of its proper divisors (4951).

83861 is a wasteful number, since it uses less digits than its factorization.

83861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950.

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

The square root of 83861 is about 289.5876378577. The cubic root of 83861 is about 43.7710211905.

The spelling of 83861 in words is "eighty-three thousand, eight hundred sixty-one".