161444217 has 32 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 96120000.

The previous prime is 161444207. The next prime is 161444221. The reversal of 161444217 is 712444161.

It is not a de Polignac number, because 161444217 - 2¹⁰ = 161443193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161444207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 891867 + ... + 892047.

It is an arithmetic number, because the mean of its divisors is an integer number (7469280).

Almost surely, 2^161444217 is an apocalyptic number.

It is an amenable number.

161444217 is a deficient number, since it is larger than the sum of its proper divisors (77572743).

161444217 is a wasteful number, since it uses less digits than its factorization.

161444217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its digits is 5376, while the sum is 30.

The square root of 161444217 is about 12706.0700848059. The cubic root of 161444217 is about 544.5120532342.

Adding to 161444217 its reverse (712444161), we get a palindrome (873888378).

The spelling of 161444217 in words is "one hundred sixty-one million, four hundred forty-four thousand, two hundred seventeen".