1216165 has 4 divisors (see below), whose sum is σ = 1459404. Its totient is φ = 972928.

The previous prime is 1216151. The next prime is 1216177. The reversal of 1216165 is 5616121.

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 641601 + 574564 = 801^2 + 758^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216165 - 2¹¹ = 1214117 is a prime.

It is a super-3 number, since 3×1216165³ = 5396333190123876375, which contains 333 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121612 + ... + 121621.

It is an arithmetic number, because the mean of its divisors is an integer number (364851).

2^1216165 is an apocalyptic number.

It is an amenable number.

1216165 is a deficient number, since it is larger than the sum of its proper divisors (243239).

1216165 is an equidigital number, since it uses as much as digits as its factorization.

1216165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243238.

The product of its digits is 360, while the sum is 22.

The square root of 1216165 is about 1102.7987123678. The cubic root of 1216165 is about 106.7408934309.

The spelling of 1216165 in words is "one million, two hundred sixteen thousand, one hundred sixty-five".