16144181 has 4 divisors (see below), whose sum is σ = 16161132. Its totient is φ = 16127232.

The previous prime is 16144159. The next prime is 16144223. The reversal of 16144181 is 18144161.

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 3964081 + 12180100 = 1991^2 + 3490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16144181 is a prime.

It is a super-2 number, since 2×16144181² = 521269160321522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 16144181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16174181) 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, 6956 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (4040283).

Almost surely, 2^16144181 is an apocalyptic number.

It is an amenable number.

16144181 is a deficient number, since it is larger than the sum of its proper divisors (16951).

16144181 is a wasteful number, since it uses less digits than its factorization.

16144181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16950.

The product of its digits is 768, while the sum is 26.

The square root of 16144181 is about 4017.9822050377. The cubic root of 16144181 is about 252.7388505509.

The spelling of 16144181 in words is "sixteen million, one hundred forty-four thousand, one hundred eighty-one".