161795609 has 4 divisors (see below), whose sum is σ = 161833140. Its totient is φ = 161758080.

The previous prime is 161795597. The next prime is 161795629. The reversal of 161795609 is 906597161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78712384 + 83083225 = 8872^2 + 9115^2 .

It is a cyclic number.

It is not a de Polignac number, because 161795609 - 2¹⁶ = 161730073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161795609.

It is not an unprimeable number, because it can be changed into a prime (161795629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11312 + ... + 21249.

It is an arithmetic number, because the mean of its divisors is an integer number (40458285).

Almost surely, 2^161795609 is an apocalyptic number.

It is an amenable number.

161795609 is a deficient number, since it is larger than the sum of its proper divisors (37531).

161795609 is an equidigital number, since it uses as much as digits as its factorization.

161795609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37530.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 161795609 is about 12719.8902904074. The cubic root of 161795609 is about 544.9068201947.

The spelling of 161795609 in words is "one hundred sixty-one million, seven hundred ninety-five thousand, six hundred nine".