67173121 has 2 divisors, whose sum is σ = 67173122. Its totient is φ = 67173120.

The previous prime is 67173109. The next prime is 67173143. The reversal of 67173121 is 12137176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64320400 + 2852721 = 8020^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 67173121 - 2¹⁷ = 67042049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67173121.

It is not a weakly prime, because it can be changed into another prime (67170121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33586560 + 33586561.

It is an arithmetic number, because the mean of its divisors is an integer number (33586561).

Almost surely, 2^67173121 is an apocalyptic number.

It is an amenable number.

67173121 is a deficient number, since it is larger than the sum of its proper divisors (1).

67173121 is an equidigital number, since it uses as much as digits as its factorization.

67173121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 67173121 is about 8195.9209976671. The cubic root of 67173121 is about 406.5043297081.

The spelling of 67173121 in words is "sixty-seven million, one hundred seventy-three thousand, one hundred twenty-one".