171920865 has 8 divisors (see below), whose sum is σ = 275073408. Its totient is φ = 91691120.

The previous prime is 171920857. The next prime is 171920893. The reversal of 171920865 is 568029171.

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

It is not a de Polignac number, because 171920865 - 2³ = 171920857 is a prime.

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, 5730681 + ... + 5730710.

It is an arithmetic number, because the mean of its divisors is an integer number (34384176).

Almost surely, 2^171920865 is an apocalyptic number.

171920865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

171920865 is a deficient number, since it is larger than the sum of its proper divisors (103152543).

171920865 is a wasteful number, since it uses less digits than its factorization.

171920865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11461399.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 171920865 is about 13111.8597079133. The cubic root of 171920865 is about 556.0444741696.

The spelling of 171920865 in words is "one hundred seventy-one million, nine hundred twenty thousand, eight hundred sixty-five".