172117423 has 2 divisors, whose sum is σ = 172117424. Its totient is φ = 172117422.

The previous prime is 172117403. The next prime is 172117453. The reversal of 172117423 is 324711271.

172117423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172117423 - 2⁵ = 172117391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172117391 and 172117400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172117403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86058711 + 86058712.

It is an arithmetic number, because the mean of its divisors is an integer number (86058712).

Almost surely, 2^172117423 is an apocalyptic number.

172117423 is a deficient number, since it is larger than the sum of its proper divisors (1).

172117423 is an equidigital number, since it uses as much as digits as its factorization.

172117423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 28.

The square root of 172117423 is about 13119.3529947174. The cubic root of 172117423 is about 556.2563029543.

Adding to 172117423 its reverse (324711271), we get a palindrome (496828694).

The spelling of 172117423 in words is "one hundred seventy-two million, one hundred seventeen thousand, four hundred twenty-three".