222391 has 4 divisors (see below), whose sum is σ = 239512. Its totient is φ = 205272.

The previous prime is 222389. The next prime is 222403. The reversal of 222391 is 193222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 222391 - 2¹ = 222389 is a prime.

It is an Ulam number.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8541 + ... + 8566.

It is an arithmetic number, because the mean of its divisors is an integer number (59878).

2²²²³⁹¹ is an apocalyptic number.

222391 is a deficient number, since it is larger than the sum of its proper divisors (17121).

222391 is a wasteful number, since it uses less digits than its factorization.

222391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17120.

The product of its digits is 216, while the sum is 19.

The square root of 222391 is about 471.5835026801. The cubic root of 222391 is about 60.5860170260.

The spelling of 222391 in words is "two hundred twenty-two thousand, three hundred ninety-one".