172004909 has 2 divisors, whose sum is σ = 172004910. Its totient is φ = 172004908.

The previous prime is 172004873. The next prime is 172004923. The reversal of 172004909 is 909400271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158886025 + 13118884 = 12605^2 + 3622^2 .

It is a cyclic number.

It is not a de Polignac number, because 172004909 - 2⁸ = 172004653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172004969) 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, 86002454 + 86002455.

It is an arithmetic number, because the mean of its divisors is an integer number (86002455).

Almost surely, 2^172004909 is an apocalyptic number.

It is an amenable number.

172004909 is a deficient number, since it is larger than the sum of its proper divisors (1).

172004909 is an equidigital number, since it uses as much as digits as its factorization.

172004909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 172004909 is about 13115.0642011391. The cubic root of 172004909 is about 556.1350673791.

The spelling of 172004909 in words is "one hundred seventy-two million, four thousand, nine hundred nine".