171117561 has 8 divisors (see below), whose sum is σ = 228217824. Its totient is φ = 114047840.

The previous prime is 171117517. The next prime is 171117577. The reversal of 171117561 is 165711171.

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 171117561 - 2⁷ = 171117433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171117061) 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, 15190 + ... + 23936.

It is an arithmetic number, because the mean of its divisors is an integer number (28527228).

Almost surely, 2^171117561 is an apocalyptic number.

It is an amenable number.

171117561 is a deficient number, since it is larger than the sum of its proper divisors (57100263).

171117561 is an equidigital number, since it uses as much as digits as its factorization.

171117561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15271.

The product of its digits is 1470, while the sum is 30.

The square root of 171117561 is about 13081.1911154910. The cubic root of 171117561 is about 555.1770784681.

The spelling of 171117561 in words is "one hundred seventy-one million, one hundred seventeen thousand, five hundred sixty-one".