22313231 has 4 divisors (see below), whose sum is σ = 23625792. Its totient is φ = 21000672.

The previous prime is 22313227. The next prime is 22313261. The reversal of 22313231 is 13231322.

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 22313231 - 2² = 22313227 is a prime.

It is a super-3 number, since 3×22313231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1312543 = 22313231 / (2 + 2 + 3 + 1 + 3 + 2 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22313261) 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, 656255 + ... + 656288.

It is an arithmetic number, because the mean of its divisors is an integer number (5906448).

Almost surely, 2^22313231 is an apocalyptic number.

22313231 is a deficient number, since it is larger than the sum of its proper divisors (1312561).

22313231 is a wasteful number, since it uses less digits than its factorization.

22313231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312560.

The product of its digits is 216, while the sum is 17.

The square root of 22313231 is about 4723.6882835344. The cubic root of 22313231 is about 281.5274979001.

Adding to 22313231 its reverse (13231322), we get a palindrome (35544553).

The spelling of 22313231 in words is "twenty-two million, three hundred thirteen thousand, two hundred thirty-one".