172105289 has 2 divisors, whose sum is σ = 172105290. Its totient is φ = 172105288.

The previous prime is 172105277. The next prime is 172105319. The reversal of 172105289 is 982501271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149940025 + 22165264 = 12245^2 + 4708^2 .

It is a cyclic number.

It is not a de Polignac number, because 172105289 - 2⁸ = 172105033 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172105489) 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, 86052644 + 86052645.

It is an arithmetic number, because the mean of its divisors is an integer number (86052645).

Almost surely, 2^172105289 is an apocalyptic number.

It is an amenable number.

172105289 is a deficient number, since it is larger than the sum of its proper divisors (1).

172105289 is an equidigital number, since it uses as much as digits as its factorization.

172105289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 172105289 is about 13118.8905399809. The cubic root of 172105289 is about 556.2432309238.

The spelling of 172105289 in words is "one hundred seventy-two million, one hundred five thousand, two hundred eighty-nine".