161409 has 8 divisors (see below), whose sum is σ = 217152. Its totient is φ = 106640.

The previous prime is 161407. The next prime is 161411. The reversal of 161409 is 904161.

It is an interprime number because it is at equal distance from previous prime (161407) and next prime (161411).

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 161409 - 2¹ = 161407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161407) 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, 364 + ... + 674.

It is an arithmetic number, because the mean of its divisors is an integer number (27144).

2¹⁶¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

161409 is a deficient number, since it is larger than the sum of its proper divisors (55743).

161409 is a wasteful number, since it uses less digits than its factorization.

161409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 161409 is about 401.7573894778. The cubic root of 161409 is about 54.4472457565.

The spelling of 161409 in words is "one hundred sixty-one thousand, four hundred nine".