11881817 has 4 divisors (see below), whose sum is σ = 11892276. Its totient is φ = 11871360.

The previous prime is 11881811. The next prime is 11881829. The reversal of 11881817 is 71818811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9096256 + 2785561 = 3016^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 11881817 - 2⁴ = 11881801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11881811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3284 + ... + 5877.

It is an arithmetic number, because the mean of its divisors is an integer number (2973069).

Almost surely, 2^11881817 is an apocalyptic number.

It is an amenable number.

11881817 is a deficient number, since it is larger than the sum of its proper divisors (10459).

11881817 is an equidigital number, since it uses as much as digits as its factorization.

11881817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10458.

The product of its digits is 3584, while the sum is 35.

The square root of 11881817 is about 3447.0011604292. The cubic root of 11881817 is about 228.1887799897.

The spelling of 11881817 in words is "eleven million, eight hundred eighty-one thousand, eight hundred seventeen".