80861 has 4 divisors (see below), whose sum is σ = 88224. Its totient is φ = 73500.

The previous prime is 80849. The next prime is 80863. The reversal of 80861 is 16808.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80861 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80863) 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, 3665 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (22056).

2⁸⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

80861 is a deficient number, since it is larger than the sum of its proper divisors (7363).

80861 is a wasteful number, since it uses less digits than its factorization.

80861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 80861 is about 284.3606864530. The cubic root of 80861 is about 43.2427232236.

The spelling of 80861 in words is "eighty thousand, eight hundred sixty-one".