11808781 has 2 divisors, whose sum is σ = 11808782. Its totient is φ = 11808780.

The previous prime is 11808749. The next prime is 11808793. The reversal of 11808781 is 18780811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 2353156 = 3075^2 + 1534^2 .

It is a cyclic number.

It is not a de Polignac number, because 11808781 - 2⁵ = 11808749 is a prime.

It is a super-2 number, since 2×11808781² = 278894617411922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11808701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5904390 + 5904391.

It is an arithmetic number, because the mean of its divisors is an integer number (5904391).

Almost surely, 2^11808781 is an apocalyptic number.

It is an amenable number.

11808781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11808781 is an equidigital number, since it uses as much as digits as its factorization.

11808781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 34.

The square root of 11808781 is about 3436.3906937367. The cubic root of 11808781 is about 227.7202696954.

The spelling of 11808781 in words is "eleven million, eight hundred eight thousand, seven hundred eighty-one".