173601661 has 2 divisors, whose sum is σ = 173601662. Its totient is φ = 173601660.

The previous prime is 173601653. The next prime is 173601679. The reversal of 173601661 is 166106371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123899161 + 49702500 = 11131^2 + 7050^2 .

It is a cyclic number.

It is not a de Polignac number, because 173601661 - 2³ = 173601653 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 (173601611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86800830 + 86800831.

It is an arithmetic number, because the mean of its divisors is an integer number (86800831).

Almost surely, 2^173601661 is an apocalyptic number.

It is an amenable number.

173601661 is a deficient number, since it is larger than the sum of its proper divisors (1).

173601661 is an equidigital number, since it uses as much as digits as its factorization.

173601661 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 31.

The square root of 173601661 is about 13175.7983059851. The cubic root of 173601661 is about 557.8506696063.

The spelling of 173601661 in words is "one hundred seventy-three million, six hundred one thousand, six hundred sixty-one".