22222231 has 4 divisors (see below), whose sum is σ = 22231672. Its totient is φ = 22212792.

The previous prime is 22222223. The next prime is 22222253. The reversal of 22222231 is 13222222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22222231 - 2³ = 22222223 is a prime.

It is a super-2 number, since 2×22222231² = 987655101234722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2005 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (5557918).

Almost surely, 2^22222231 is an apocalyptic number.

22222231 is a deficient number, since it is larger than the sum of its proper divisors (9441).

22222231 is an equidigital number, since it uses as much as digits as its factorization.

22222231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9440.

The product of its digits is 192, while the sum is 16.

The square root of 22222231 is about 4714.0461389342. The cubic root of 22222231 is about 281.1442587846.

Adding to 22222231 its reverse (13222222), we get a palindrome (35444453).

Subtracting from 22222231 its reverse (13222222), we obtain a palindrome (9000009).

The spelling of 22222231 in words is "twenty-two million, two hundred twenty-two thousand, two hundred thirty-one".