173704561 has 2 divisors, whose sum is σ = 173704562. Its totient is φ = 173704560.

The previous prime is 173704543. The next prime is 173704567. The reversal of 173704561 is 165407371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169000000 + 4704561 = 13000^2 + 2169^2 .

It is a cyclic number.

It is not a de Polignac number, because 173704561 - 2⁹ = 173704049 is a prime.

It is not a weakly prime, because it can be changed into another prime (173704567) 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, 86852280 + 86852281.

It is an arithmetic number, because the mean of its divisors is an integer number (86852281).

Almost surely, 2^173704561 is an apocalyptic number.

It is an amenable number.

173704561 is a deficient number, since it is larger than the sum of its proper divisors (1).

173704561 is an equidigital number, since it uses as much as digits as its factorization.

173704561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 173704561 is about 13179.7026142474. The cubic root of 173704561 is about 557.9608672770.

The spelling of 173704561 in words is "one hundred seventy-three million, seven hundred four thousand, five hundred sixty-one".