171928009 has 8 divisors (see below), whose sum is σ = 188065152. Its totient is φ = 155875440.

The previous prime is 171927997. The next prime is 171928019. The reversal of 171928009 is 900829171.

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 171928009 - 2⁷ = 171927881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171928019) 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, 16849 + ... + 25054.

It is an arithmetic number, because the mean of its divisors is an integer number (23508144).

Almost surely, 2^171928009 is an apocalyptic number.

It is an amenable number.

171928009 is a deficient number, since it is larger than the sum of its proper divisors (16137143).

171928009 is a wasteful number, since it uses less digits than its factorization.

171928009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42287.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 171928009 is about 13112.1321302067. The cubic root of 171928009 is about 556.0521760207.

The spelling of 171928009 in words is "one hundred seventy-one million, nine hundred twenty-eight thousand, nine".