172006423 has 2 divisors, whose sum is σ = 172006424. Its totient is φ = 172006422.

The previous prime is 172006421. The next prime is 172006427. The reversal of 172006423 is 324600271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172006423 - 2¹ = 172006421 is a prime.

Together with 172006421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172006421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86003211 + 86003212.

It is an arithmetic number, because the mean of its divisors is an integer number (86003212).

Almost surely, 2^172006423 is an apocalyptic number.

172006423 is a deficient number, since it is larger than the sum of its proper divisors (1).

172006423 is an equidigital number, since it uses as much as digits as its factorization.

172006423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 172006423 is about 13115.1219208973. The cubic root of 172006423 is about 556.1366990884.

Adding to 172006423 its reverse (324600271), we get a palindrome (496606694).

The spelling of 172006423 in words is "one hundred seventy-two million, six thousand, four hundred twenty-three".