172811117 has 2 divisors, whose sum is σ = 172811118. Its totient is φ = 172811116.

The previous prime is 172811113. The next prime is 172811129. The reversal of 172811117 is 711118271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149181796 + 23629321 = 12214^2 + 4861^2 .

It is an emirp because it is prime and its reverse (711118271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172811117 - 2² = 172811113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172811117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172811113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86405558 + 86405559.

It is an arithmetic number, because the mean of its divisors is an integer number (86405559).

Almost surely, 2^172811117 is an apocalyptic number.

It is an amenable number.

172811117 is a deficient number, since it is larger than the sum of its proper divisors (1).

172811117 is an equidigital number, since it uses as much as digits as its factorization.

172811117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 29.

The square root of 172811117 is about 13145.7642227449. The cubic root of 172811117 is about 557.0026043475.

Adding to 172811117 its reverse (711118271), we get a palindrome (883929388).

The spelling of 172811117 in words is "one hundred seventy-two million, eight hundred eleven thousand, one hundred seventeen".