22725217 has 2 divisors, whose sum is σ = 22725218. Its totient is φ = 22725216.

The previous prime is 22725211. The next prime is 22725221. The reversal of 22725217 is 71252722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13957696 + 8767521 = 3736^2 + 2961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22725217 is a prime.

It is a super-3 number, since 3×22725217³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (22725211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11362608 + 11362609.

It is an arithmetic number, because the mean of its divisors is an integer number (11362609).

Almost surely, 2^22725217 is an apocalyptic number.

It is an amenable number.

22725217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22725217 is an equidigital number, since it uses as much as digits as its factorization.

22725217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 28.

The square root of 22725217 is about 4767.0973348569. The cubic root of 22725217 is about 283.2496267913.

Adding to 22725217 its reverse (71252722), we get a palindrome (93977939).

The spelling of 22725217 in words is "twenty-two million, seven hundred twenty-five thousand, two hundred seventeen".