11381165 has 4 divisors (see below), whose sum is σ = 13657404. Its totient is φ = 9104928.

The previous prime is 11381147. The next prime is 11381173. The reversal of 11381165 is 56118311.

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 8655364 + 2725801 = 2942^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 11381165 - 2⁶ = 11381101 is a prime.

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, 1138112 + ... + 1138121.

It is an arithmetic number, because the mean of its divisors is an integer number (3414351).

Almost surely, 2^11381165 is an apocalyptic number.

It is an amenable number.

11381165 is a deficient number, since it is larger than the sum of its proper divisors (2276239).

11381165 is an equidigital number, since it uses as much as digits as its factorization.

11381165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276238.

The product of its digits is 720, while the sum is 26.

The square root of 11381165 is about 3373.5982274124. The cubic root of 11381165 is about 224.9376946826.

Adding to 11381165 its reverse (56118311), we get a palindrome (67499476).

The spelling of 11381165 in words is "eleven million, three hundred eighty-one thousand, one hundred sixty-five".