68861 has 4 divisors (see below), whose sum is σ = 74172. Its totient is φ = 63552.

The previous prime is 68821. The next prime is 68863. The reversal of 68861 is 16886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16886 = 2 ⋅8443.

It can be written as a sum of positive squares in 2 ways, for example, as 32761 + 36100 = 181^2 + 190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 68861.

It is not an unprimeable number, because it can be changed into a prime (68863) 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, 2636 + ... + 2661.

It is an arithmetic number, because the mean of its divisors is an integer number (18543).

2⁶⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

68861 is a deficient number, since it is larger than the sum of its proper divisors (5311).

68861 is a wasteful number, since it uses less digits than its factorization.

68861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310.

The product of its digits is 2304, while the sum is 29.

The square root of 68861 is about 262.4137953691. The cubic root of 68861 is about 40.9880988658.

It can be divided in two parts, 68 and 861, that added together give a palindrome (929).

The spelling of 68861 in words is "sixty-eight thousand, eight hundred sixty-one".