11226781 has 2 divisors, whose sum is σ = 11226782. Its totient is φ = 11226780.

The previous prime is 11226779. The next prime is 11226791. The reversal of 11226781 is 18762211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 793881 = 3230^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 11226781 - 2¹ = 11226779 is a prime.

It is a super-2 number, since 2×11226781² = 252081223243922, which contains 22 as substring.

Together with 11226779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11226731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5613390 + 5613391.

It is an arithmetic number, because the mean of its divisors is an integer number (5613391).

Almost surely, 2^11226781 is an apocalyptic number.

It is an amenable number.

11226781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11226781 is an equidigital number, since it uses as much as digits as its factorization.

11226781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 11226781 is about 3350.6388943006. The cubic root of 11226781 is about 223.9159774688.

Adding to 11226781 its reverse (18762211), we get a palindrome (29988992).

The spelling of 11226781 in words is "eleven million, two hundred twenty-six thousand, seven hundred eighty-one".