172424009 has 2 divisors, whose sum is σ = 172424010. Its totient is φ = 172424008.

The previous prime is 172423991. The next prime is 172424011. The reversal of 172424009 is 900424271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97081609 + 75342400 = 9853^2 + 8680^2 .

It is a cyclic number.

It is not a de Polignac number, because 172424009 - 2⁸ = 172423753 is a prime.

Together with 172424011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172424089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86212004 + 86212005.

It is an arithmetic number, because the mean of its divisors is an integer number (86212005).

Almost surely, 2^172424009 is an apocalyptic number.

It is an amenable number.

172424009 is a deficient number, since it is larger than the sum of its proper divisors (1).

172424009 is an equidigital number, since it uses as much as digits as its factorization.

172424009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 172424009 is about 13131.0322899611. The cubic root of 172424009 is about 556.5863862061.

The spelling of 172424009 in words is "one hundred seventy-two million, four hundred twenty-four thousand, nine".