18641165 has 8 divisors (see below), whose sum is σ = 22466808. Its totient is φ = 14848000.

The previous prime is 18641153. The next prime is 18641167. The reversal of 18641165 is 56114681.

It can be written as a sum of positive squares in 4 ways, for example, as 2271049 + 16370116 = 1507^2 + 4046^2 .

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

It is not a de Polignac number, because 18641165 - 2¹⁶ = 18575629 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 (18641167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6836 + ... + 9165.

It is an arithmetic number, because the mean of its divisors is an integer number (2808351).

Almost surely, 2^18641165 is an apocalyptic number.

It is an amenable number.

18641165 is a deficient number, since it is larger than the sum of its proper divisors (3825643).

18641165 is a wasteful number, since it uses less digits than its factorization.

18641165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16239.

The product of its digits is 5760, while the sum is 32.

The square root of 18641165 is about 4317.5415458337. The cubic root of 18641165 is about 265.1496247705.

The spelling of 18641165 in words is "eighteen million, six hundred forty-one thousand, one hundred sixty-five".