11011381 has 2 divisors, whose sum is σ = 11011382. Its totient is φ = 11011380.

The previous prime is 11011379. The next prime is 11011409. The reversal of 11011381 is 18311011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10304100 + 707281 = 3210^2 + 841^2 .

It is an emirp because it is prime and its reverse (18311011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11011381 - 2¹ = 11011379 is a prime.

It is a super-2 number, since 2×11011381² = 242501023054322, which contains 22 as substring.

Together with 11011379, 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 (11011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505690 + 5505691.

It is an arithmetic number, because the mean of its divisors is an integer number (5505691).

Almost surely, 2^11011381 is an apocalyptic number.

It is an amenable number.

11011381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011381 is an equidigital number, since it uses as much as digits as its factorization.

11011381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

The square root of 11011381 is about 3318.3400970967. The cubic root of 11011381 is about 222.4746829756.

Adding to 11011381 its reverse (18311011), we get a palindrome (29322392).

The spelling of 11011381 in words is "eleven million, eleven thousand, three hundred eighty-one".