11164781 has 2 divisors, whose sum is σ = 11164782. Its totient is φ = 11164780.

The previous prime is 11164771. The next prime is 11164793. The reversal of 11164781 is 18746111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 2500 = 3341^2 + 50^2 .

It is an emirp because it is prime and its reverse (18746111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11164781 - 2⁶ = 11164717 is a prime.

It is a super-2 number, since 2×11164781² = 249304669555922, which contains 22 as substring.

It is a Sophie Germain 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 (11164711) 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 as a sum of consecutive naturals, namely, 5582390 + 5582391.

It is an arithmetic number, because the mean of its divisors is an integer number (5582391).

Almost surely, 2^11164781 is an apocalyptic number.

It is an amenable number.

11164781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11164781 is an equidigital number, since it uses as much as digits as its factorization.

11164781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 29.

The square root of 11164781 is about 3341.3741185327. The cubic root of 11164781 is about 223.5030236801.

The spelling of 11164781 in words is "eleven million, one hundred sixty-four thousand, seven hundred eighty-one".