173172449 has 2 divisors, whose sum is σ = 173172450. Its totient is φ = 173172448.

The previous prime is 173172443. The next prime is 173172457. The reversal of 173172449 is 944271371.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152967424 + 20205025 = 12368^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 173172449 - 2⁸ = 173172193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (173172443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86586224 + 86586225.

It is an arithmetic number, because the mean of its divisors is an integer number (86586225).

Almost surely, 2^173172449 is an apocalyptic number.

It is an amenable number.

173172449 is a deficient number, since it is larger than the sum of its proper divisors (1).

173172449 is an equidigital number, since it uses as much as digits as its factorization.

173172449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 173172449 is about 13159.5003324594. The cubic root of 173172449 is about 557.3905476644.

The spelling of 173172449 in words is "one hundred seventy-three million, one hundred seventy-two thousand, four hundred forty-nine".