11816015 has 4 divisors (see below), whose sum is σ = 14179224. Its totient is φ = 9452808.

The previous prime is 11816011. The next prime is 11816017. The reversal of 11816015 is 51061811.

It is a happy number.

11816015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51061811 = 367 ⋅139133.

It is a cyclic number.

It is not a de Polignac number, because 11816015 - 2² = 11816011 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 (11816011) 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, 1181597 + ... + 1181606.

It is an arithmetic number, because the mean of its divisors is an integer number (3544806).

Almost surely, 2^11816015 is an apocalyptic number.

11816015 is a deficient number, since it is larger than the sum of its proper divisors (2363209).

11816015 is an equidigital number, since it uses as much as digits as its factorization.

11816015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363208.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 11816015 is about 3437.4430904380. The cubic root of 11816015 is about 227.7667603017.

Adding to 11816015 its reverse (51061811), we get a palindrome (62877826).

The spelling of 11816015 in words is "eleven million, eight hundred sixteen thousand, fifteen".