161827909 has 8 divisors (see below), whose sum is σ = 165450240. Its totient is φ = 158213136.

The previous prime is 161827901. The next prime is 161827949. The reversal of 161827909 is 909728161.

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 161827909 - 2³ = 161827901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161827901) 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, 77412 + ... + 79474.

It is an arithmetic number, because the mean of its divisors is an integer number (20681280).

Almost surely, 2^161827909 is an apocalyptic number.

It is an amenable number.

161827909 is a deficient number, since it is larger than the sum of its proper divisors (3622331).

161827909 is a wasteful number, since it uses less digits than its factorization.

161827909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3779.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 161827909 is about 12721.1598920853. The cubic root of 161827909 is about 544.9430785318.

The spelling of 161827909 in words is "one hundred sixty-one million, eight hundred twenty-seven thousand, nine hundred nine".