172240417 has 2 divisors, whose sum is σ = 172240418. Its totient is φ = 172240416.

The previous prime is 172240403. The next prime is 172240427. The reversal of 172240417 is 714042271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153784801 + 18455616 = 12401^2 + 4296^2 .

It is a cyclic number.

It is not a de Polignac number, because 172240417 - 2¹¹ = 172238369 is a prime.

It is a super-2 number, since 2×172240417² = 59333522496667778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172240427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86120208 + 86120209.

It is an arithmetic number, because the mean of its divisors is an integer number (86120209).

Almost surely, 2^172240417 is an apocalyptic number.

It is an amenable number.

172240417 is a deficient number, since it is larger than the sum of its proper divisors (1).

172240417 is an equidigital number, since it uses as much as digits as its factorization.

172240417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 172240417 is about 13124.0396601047. The cubic root of 172240417 is about 556.3887704609.

Adding to 172240417 its reverse (714042271), we get a palindrome (886282688).

The spelling of 172240417 in words is "one hundred seventy-two million, two hundred forty thousand, four hundred seventeen".