172224617 has 2 divisors, whose sum is σ = 172224618. Its totient is φ = 172224616.

The previous prime is 172224587. The next prime is 172224631. The reversal of 172224617 is 716422271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142587481 + 29637136 = 11941^2 + 5444^2 .

It is an emirp because it is prime and its reverse (716422271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172224617 - 2⁶ = 172224553 is a prime.

It is a super-2 number, since 2×172224617² = 59322637401593378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (177224617) 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, 86112308 + 86112309.

It is an arithmetic number, because the mean of its divisors is an integer number (86112309).

Almost surely, 2^172224617 is an apocalyptic number.

It is an amenable number.

172224617 is a deficient number, since it is larger than the sum of its proper divisors (1).

172224617 is an equidigital number, since it uses as much as digits as its factorization.

172224617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 172224617 is about 13123.4376974937. The cubic root of 172224617 is about 556.3717570105.

Adding to 172224617 its reverse (716422271), we get a palindrome (888646888).

The spelling of 172224617 in words is "one hundred seventy-two million, two hundred twenty-four thousand, six hundred seventeen".