222381 has 6 divisors (see below), whose sum is σ = 321230. Its totient is φ = 148248.

The previous prime is 222379. The next prime is 222389. The reversal of 222381 is 183222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 202500 + 19881 = 450^2 + 141^2 .

It is not a de Polignac number, because 222381 - 2¹ = 222379 is a prime.

It is a super-2 number, since 2×222381² = 98906618322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12346 + ... + 12363.

2²²²³⁸¹ is an apocalyptic number.

It is an amenable number.

222381 is a deficient number, since it is larger than the sum of its proper divisors (98849).

222381 is a wasteful number, since it uses less digits than its factorization.

222381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24715 (or 24712 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 222381 is about 471.5728999847. The cubic root of 222381 is about 60.5851089118.

It can be divided in two parts, 2223 and 81, that added together give a square (2304 = 48²).

The spelling of 222381 in words is "two hundred twenty-two thousand, three hundred eighty-one".