11817013 has 8 divisors (see below), whose sum is σ = 12765368. Its totient is φ = 10874304.

The previous prime is 11816999. The next prime is 11817019. The reversal of 11817013 is 31071811.

It can be written as a sum of positive squares in 4 ways, for example, as 2617924 + 9199089 = 1618^2 + 3033^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11817013 - 2¹⁷ = 11685941 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 (11817019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3631 + ... + 6067.

It is an arithmetic number, because the mean of its divisors is an integer number (1595671).

Almost surely, 2^11817013 is an apocalyptic number.

11817013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11817013 is a deficient number, since it is larger than the sum of its proper divisors (948355).

11817013 is a wasteful number, since it uses less digits than its factorization.

11817013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 11817013 is about 3437.5882534126. The cubic root of 11817013 is about 227.7731726392.

Adding to 11817013 its reverse (31071811), we get a palindrome (42888824).

The spelling of 11817013 in words is "eleven million, eight hundred seventeen thousand, thirteen".