22531217 has 2 divisors, whose sum is σ = 22531218. Its totient is φ = 22531216.

The previous prime is 22531193. The next prime is 22531241. The reversal of 22531217 is 71213522.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (22531193) and next prime (22531241).

It can be written as a sum of positive squares in only one way, i.e., 21939856 + 591361 = 4684^2 + 769^2 .

It is a cyclic number.

It is not a de Polignac number, because 22531217 - 2⁶ = 22531153 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22531192 and 22531201.

It is not a weakly prime, because it can be changed into another prime (22531277) 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 as a sum of consecutive naturals, namely, 11265608 + 11265609.

It is an arithmetic number, because the mean of its divisors is an integer number (11265609).

Almost surely, 2^22531217 is an apocalyptic number.

It is an amenable number.

22531217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22531217 is an equidigital number, since it uses as much as digits as its factorization.

22531217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 22531217 is about 4746.7059104183. The cubic root of 22531217 is about 282.4413097594.

Adding to 22531217 its reverse (71213522), we get a palindrome (93744739).

The spelling of 22531217 in words is "twenty-two million, five hundred thirty-one thousand, two hundred seventeen".