11668813 has 4 divisors (see below), whose sum is σ = 12566428. Its totient is φ = 10771200.

The previous prime is 11668807. The next prime is 11668819. The reversal of 11668813 is 31886611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31886611 = 17 ⋅1875683.

It is an interprime number because it is at equal distance from previous prime (11668807) and next prime (11668819).

It can be written as a sum of positive squares in 2 ways, for example, as 3755844 + 7912969 = 1938^2 + 2813^2 .

It is a cyclic number.

It is not a de Polignac number, because 11668813 - 2¹⁷ = 11537741 is a prime.

It is a super-2 number, since 2×11668813² = 272322393657938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11668819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448788 + ... + 448813.

It is an arithmetic number, because the mean of its divisors is an integer number (3141607).

Almost surely, 2^11668813 is an apocalyptic number.

11668813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11668813 is a deficient number, since it is larger than the sum of its proper divisors (897615).

11668813 is an equidigital number, since it uses as much as digits as its factorization.

11668813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897614.

The product of its digits is 6912, while the sum is 34.

The square root of 11668813 is about 3415.9644318991. The cubic root of 11668813 is about 226.8169781072.

The spelling of 11668813 in words is "eleven million, six hundred sixty-eight thousand, eight hundred thirteen".