22861 has 2 divisors, whose sum is σ = 22862. Its totient is φ = 22860.

The previous prime is 22859. The next prime is 22871. The reversal of 22861 is 16822.

It is a happy number.

22861 is nontrivially palindromic in base 2.

22861 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22500 + 361 = 150^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 22861 - 2¹ = 22859 is a prime.

Together with 22859, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11430 + 11431.

It is an arithmetic number, because the mean of its divisors is an integer number (11431).

2²²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

22861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22861 is an equidigital number, since it uses as much as digits as its factorization.

22861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 22861 is about 151.1985449665. The cubic root of 22861 is about 28.3812645060.

It can be divided in two parts, 228 and 61, that added together give a square (289 = 17²).

The spelling of 22861 in words is "twenty-two thousand, eight hundred sixty-one".