11227781 has 2 divisors, whose sum is σ = 11227782. Its totient is φ = 11227780.

The previous prime is 11227771. The next prime is 11227807. The reversal of 11227781 is 18772211.

11227781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 112225 = 3334^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 11227781 - 2¹⁰ = 11226757 is a prime.

It is a super-2 number, since 2×11227781² = 252126132367922, which contains 22 as substring.

It is equal to p₇₄₀₅₇₆ and since 11227781 and 740576 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11227751) 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, 5613890 + 5613891.

It is an arithmetic number, because the mean of its divisors is an integer number (5613891).

Almost surely, 2^11227781 is an apocalyptic number.

It is an amenable number.

11227781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11227781 is an equidigital number, since it uses as much as digits as its factorization.

11227781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 29.

The square root of 11227781 is about 3350.7881162497. The cubic root of 11227781 is about 223.9226255403.

Adding to 11227781 its reverse (18772211), we get a palindrome (29999992).

The spelling of 11227781 in words is "eleven million, two hundred twenty-seven thousand, seven hundred eighty-one".