11317781 has 2 divisors, whose sum is σ = 11317782. Its totient is φ = 11317780.

The previous prime is 11317769. The next prime is 11317799. The reversal of 11317781 is 18771311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10297681 + 1020100 = 3209^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 11317781 - 2⁶ = 11317717 is a prime.

It is a super-2 number, since 2×11317781² = 256184333527922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11317181) 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 as a sum of consecutive naturals, namely, 5658890 + 5658891.

It is an arithmetic number, because the mean of its divisors is an integer number (5658891).

Almost surely, 2^11317781 is an apocalyptic number.

It is an amenable number.

11317781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11317781 is an equidigital number, since it uses as much as digits as its factorization.

11317781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 29.

The square root of 11317781 is about 3364.1909874441. The cubic root of 11317781 is about 224.5193426488.

The spelling of 11317781 in words is "eleven million, three hundred seventeen thousand, seven hundred eighty-one".