172430717 has 2 divisors, whose sum is σ = 172430718. Its totient is φ = 172430716.

The previous prime is 172430683. The next prime is 172430729. The reversal of 172430717 is 717034271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 35868121 = 11686^2 + 5989^2 .

It is an emirp because it is prime and its reverse (717034271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172430717 - 2⁶ = 172430653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172430777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86215358 + 86215359.

It is an arithmetic number, because the mean of its divisors is an integer number (86215359).

Almost surely, 2^172430717 is an apocalyptic number.

It is an amenable number.

172430717 is a deficient number, since it is larger than the sum of its proper divisors (1).

172430717 is an equidigital number, since it uses as much as digits as its factorization.

172430717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 172430717 is about 13131.2877129397. The cubic root of 172430717 is about 556.5936039423.

Adding to 172430717 its reverse (717034271), we get a palindrome (889464988).

The spelling of 172430717 in words is "one hundred seventy-two million, four hundred thirty thousand, seven hundred seventeen".