165049181 has 8 divisors (see below), whose sum is σ = 189530400. Its totient is φ = 142147440.

The previous prime is 165049151. The next prime is 165049189. The reversal of 165049181 is 181940561.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165049181 is a prime.

It is a super-2 number, since 2×165049181² = 54482464297541522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165049189) 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 7 ways as a sum of consecutive naturals, for example, 394646 + ... + 395063.

It is an arithmetic number, because the mean of its divisors is an integer number (23691300).

Almost surely, 2^165049181 is an apocalyptic number.

165049181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165049181 is a deficient number, since it is larger than the sum of its proper divisors (24481219).

165049181 is a wasteful number, since it uses less digits than its factorization.

165049181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789739.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 165049181 is about 12847.1468038627. The cubic root of 165049181 is about 548.5351444300.

The spelling of 165049181 in words is "one hundred sixty-five million, forty-nine thousand, one hundred eighty-one".