22531231 has 12 divisors (see below), whose sum is σ = 23719072. Its totient is φ = 21397824.

The previous prime is 22531217. The next prime is 22531241. The reversal of 22531231 is 13213522.

It is not a de Polignac number, because 22531231 - 2¹¹ = 22529183 is a prime.

It is a super-2 number, since 2×22531231² = 1015312740750722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22531199 and 22531208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22531241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61210 + ... + 61576.

Almost surely, 2^22531231 is an apocalyptic number.

22531231 is a deficient number, since it is larger than the sum of its proper divisors (1187841).

22531231 is an equidigital number, since it uses as much as digits as its factorization.

22531231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 469 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 22531231 is about 4746.7073851250. The cubic root of 22531231 is about 282.4413682586.

Adding to 22531231 its reverse (13213522), we get a palindrome (35744753).

The spelling of 22531231 in words is "twenty-two million, five hundred thirty-one thousand, two hundred thirty-one".