161724009 has 8 divisors (see below), whose sum is σ = 228316320. Its totient is φ = 101473856.

The previous prime is 161724007. The next prime is 161724011. The reversal of 161724009 is 900427161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161724007) and next prime (161724011).

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 161724009 - 2¹ = 161724007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161724001) 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, 1585479 + ... + 1585580.

It is an arithmetic number, because the mean of its divisors is an integer number (28539540).

Almost surely, 2^161724009 is an apocalyptic number.

It is an amenable number.

161724009 is a deficient number, since it is larger than the sum of its proper divisors (66592311).

161724009 is a wasteful number, since it uses less digits than its factorization.

161724009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171079.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 161724009 is about 12717.0754892782. The cubic root of 161724009 is about 544.8264284684.

The spelling of 161724009 in words is "one hundred sixty-one million, seven hundred twenty-four thousand, nine".