171972005 has 8 divisors (see below), whose sum is σ = 208295712. Its totient is φ = 136291408.

The previous prime is 171971959. The next prime is 171972029. The reversal of 171972005 is 500279171.

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 171972005 - 2¹⁴ = 171955621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160187 + ... + 161256.

It is an arithmetic number, because the mean of its divisors is an integer number (26036964).

Almost surely, 2^171972005 is an apocalyptic number.

It is an amenable number.

171972005 is a deficient number, since it is larger than the sum of its proper divisors (36323707).

171972005 is a wasteful number, since it uses less digits than its factorization.

171972005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321555.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 171972005 is about 13113.8097058025. The cubic root of 171972005 is about 556.0996028191.

The spelling of 171972005 in words is "one hundred seventy-one million, nine hundred seventy-two thousand, five".