126720173 has 2 divisors, whose sum is σ = 126720174. Its totient is φ = 126720172.

The previous prime is 126720151. The next prime is 126720199. The reversal of 126720173 is 371027621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96393124 + 30327049 = 9818^2 + 5507^2 .

It is a cyclic number.

It is not a de Polignac number, because 126720173 - 2⁶ = 126720109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126720103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63360086 + 63360087.

It is an arithmetic number, because the mean of its divisors is an integer number (63360087).

Almost surely, 2^126720173 is an apocalyptic number.

It is an amenable number.

126720173 is a deficient number, since it is larger than the sum of its proper divisors (1).

126720173 is an equidigital number, since it uses as much as digits as its factorization.

126720173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 126720173 is about 11257.0055076828. The cubic root of 126720173 is about 502.2831228321.

Adding to 126720173 its reverse (371027621), we get a palindrome (497747794).

The spelling of 126720173 in words is "one hundred twenty-six million, seven hundred twenty thousand, one hundred seventy-three".