11665217 has 4 divisors (see below), whose sum is σ = 11732820. Its totient is φ = 11597616.

The previous prime is 11665211. The next prime is 11665223. The reversal of 11665217 is 71256611.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11665211) and next prime (11665223).

It can be written as a sum of positive squares in 2 ways, for example, as 4477456 + 7187761 = 2116^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 11665217 - 2¹² = 11661121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11665217.

It is not an unprimeable number, because it can be changed into a prime (11665211) 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, 33542 + ... + 33887.

It is an arithmetic number, because the mean of its divisors is an integer number (2933205).

Almost surely, 2^11665217 is an apocalyptic number.

It is an amenable number.

11665217 is a deficient number, since it is larger than the sum of its proper divisors (67603).

11665217 is an equidigital number, since it uses as much as digits as its factorization.

11665217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67602.

The product of its digits is 2520, while the sum is 29.

The square root of 11665217 is about 3415.4380392565. The cubic root of 11665217 is about 226.7936761755.

The spelling of 11665217 in words is "eleven million, six hundred sixty-five thousand, two hundred seventeen".