180861 has 12 divisors (see below), whose sum is σ = 256032. Its totient is φ = 113544.

The previous prime is 180847. The next prime is 180871. The reversal of 180861 is 168081.

180861 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 180861 - 2⁶ = 180797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1000 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (21336).

2¹⁸⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

180861 is a deficient number, since it is larger than the sum of its proper divisors (75171).

180861 is a wasteful number, since it uses less digits than its factorization.

180861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 180861 is about 425.2775564264. The cubic root of 180861 is about 56.5520443521.

The spelling of 180861 in words is "one hundred eighty thousand, eight hundred sixty-one".