173120561 has 8 divisors (see below), whose sum is σ = 174750048. Its totient is φ = 171496000.

The previous prime is 173120551. The next prime is 173120569. The reversal of 173120561 is 165021371.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 173120561 - 2¹⁸ = 172858417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 173120561.

It is not an unprimeable number, because it can be changed into a prime (173120569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126521 + ... + 127881.

It is an arithmetic number, because the mean of its divisors is an integer number (21843756).

Almost surely, 2^173120561 is an apocalyptic number.

It is an amenable number.

173120561 is a deficient number, since it is larger than the sum of its proper divisors (1629487).

173120561 is a wasteful number, since it uses less digits than its factorization.

173120561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 173120561 is about 13157.5286813292. The cubic root of 173120561 is about 557.3348714295.

The spelling of 173120561 in words is "one hundred seventy-three million, one hundred twenty thousand, five hundred sixty-one".