161848109 has 4 divisors (see below), whose sum is σ = 171368604. Its totient is φ = 152327616.

The previous prime is 161848097. The next prime is 161848133. The reversal of 161848109 is 901848161.

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 73582084 + 88266025 = 8578^2 + 9395^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161848109 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 (161848139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4760222 + ... + 4760255.

It is an arithmetic number, because the mean of its divisors is an integer number (42842151).

Almost surely, 2^161848109 is an apocalyptic number.

It is an amenable number.

161848109 is a deficient number, since it is larger than the sum of its proper divisors (9520495).

161848109 is an equidigital number, since it uses as much as digits as its factorization.

161848109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9520494.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 161848109 is about 12721.9538200702. The cubic root of 161848109 is about 544.9657515723.

The spelling of 161848109 in words is "one hundred sixty-one million, eight hundred forty-eight thousand, one hundred nine".