172400117 has 2 divisors, whose sum is σ = 172400118. Its totient is φ = 172400116.

The previous prime is 172400113. The next prime is 172400143. The reversal of 172400117 is 711004271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172291876 + 108241 = 13126^2 + 329^2 .

It is an emirp because it is prime and its reverse (711004271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172400117 - 2² = 172400113 is a prime.

It is a super-2 number, since 2×172400117² = 59443600683227378, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 172400092 and 172400101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172400113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86200058 + 86200059.

It is an arithmetic number, because the mean of its divisors is an integer number (86200059).

Almost surely, 2^172400117 is an apocalyptic number.

It is an amenable number.

172400117 is a deficient number, since it is larger than the sum of its proper divisors (1).

172400117 is an equidigital number, since it uses as much as digits as its factorization.

172400117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 172400117 is about 13130.1225051406. The cubic root of 172400117 is about 556.5606771487.

Adding to 172400117 its reverse (711004271), we get a palindrome (883404388).

The spelling of 172400117 in words is "one hundred seventy-two million, four hundred thousand, one hundred seventeen".