22406231 has 2 divisors, whose sum is σ = 22406232. Its totient is φ = 22406230.

The previous prime is 22406203. The next prime is 22406233. The reversal of 22406231 is 13260422.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22406231 is a prime.

It is a super-2 number, since 2×22406231² = 1004078375250722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 22406233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22406233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11203115 + 11203116.

It is an arithmetic number, because the mean of its divisors is an integer number (11203116).

Almost surely, 2^22406231 is an apocalyptic number.

22406231 is a deficient number, since it is larger than the sum of its proper divisors (1).

22406231 is an equidigital number, since it uses as much as digits as its factorization.

22406231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 22406231 is about 4733.5220502286. The cubic root of 22406231 is about 281.9180847870.

Adding to 22406231 its reverse (13260422), we get a palindrome (35666653).

The spelling of 22406231 in words is "twenty-two million, four hundred six thousand, two hundred thirty-one".