161241609 has 8 divisors (see below), whose sum is σ = 215092192. Its totient is φ = 107442720.

The previous prime is 161241599. The next prime is 161241611. The reversal of 161241609 is 906142161.

It is a happy number.

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

It is not a de Polignac number, because 161241609 - 2⁴ = 161241593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161241649) 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, 4939 + ... + 18624.

It is an arithmetic number, because the mean of its divisors is an integer number (26886524).

Almost surely, 2^161241609 is an apocalyptic number.

It is an amenable number.

161241609 is a deficient number, since it is larger than the sum of its proper divisors (53850583).

161241609 is a wasteful number, since it uses less digits than its factorization.

161241609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25847.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 161241609 is about 12698.0946995996. The cubic root of 161241609 is about 544.2841753891.

The spelling of 161241609 in words is "one hundred sixty-one million, two hundred forty-one thousand, six hundred nine".