165544249 has 8 divisors (see below), whose sum is σ = 188765640. Its totient is φ = 143821056.

The previous prime is 165544243. The next prime is 165544277. The reversal of 165544249 is 942445561.

It can be written as a sum of positive squares in 4 ways, for example, as 44983849 + 120560400 = 6707^2 + 10980^2 .

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 165544249 - 2³ = 165544241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165544241) 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 7 ways as a sum of consecutive naturals, for example, 374314 + ... + 374755.

It is an arithmetic number, because the mean of its divisors is an integer number (23595705).

Almost surely, 2^165544249 is an apocalyptic number.

It is an amenable number.

165544249 is a deficient number, since it is larger than the sum of its proper divisors (23221391).

165544249 is a wasteful number, since it uses less digits than its factorization.

165544249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749099.

The product of its digits is 172800, while the sum is 40.

The square root of 165544249 is about 12866.4000015544. The cubic root of 165544249 is about 549.0830440080.

The spelling of 165544249 in words is "one hundred sixty-five million, five hundred forty-four thousand, two hundred forty-nine".