171679561 has 16 divisors (see below), whose sum is σ = 179055360. Its totient is φ = 164511360.

The previous prime is 171679553. The next prime is 171679603. The reversal of 171679561 is 165976171.

It is a 4-Lehmer number, since φ(171679561) divides (171679561-1)⁴.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 171679561 - 2³ = 171679553 is a prime.

It is a deceptive number, since it divides R_171679560.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171679961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548341 + ... + 548653.

It is an arithmetic number, because the mean of its divisors is an integer number (11190960).

It is a Poulet number, since it divides 2^171679560-1.

Almost surely, 2^171679561 is an apocalyptic number.

It is an amenable number.

171679561 is a deficient number, since it is larger than the sum of its proper divisors (7375799).

171679561 is a wasteful number, since it uses less digits than its factorization.

171679561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its digits is 79380, while the sum is 43.

The square root of 171679561 is about 13102.6547310078. The cubic root of 171679561 is about 555.7842021348.

The spelling of 171679561 in words is "one hundred seventy-one million, six hundred seventy-nine thousand, five hundred sixty-one".