11373781 has 2 divisors, whose sum is σ = 11373782. Its totient is φ = 11373780.

The previous prime is 11373767. The next prime is 11373787. The reversal of 11373781 is 18737311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 4691556 = 2585^2 + 2166^2 .

It is an emirp because it is prime and its reverse (18737311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11373781 - 2⁹ = 11373269 is a prime.

It is a super-2 number, since 2×11373781² = 258725788471922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11373787) 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, 5686890 + 5686891.

It is an arithmetic number, because the mean of its divisors is an integer number (5686891).

Almost surely, 2^11373781 is an apocalyptic number.

It is an amenable number.

11373781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11373781 is an equidigital number, since it uses as much as digits as its factorization.

11373781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 11373781 is about 3372.5036693827. The cubic root of 11373781 is about 224.8890382909.

The spelling of 11373781 in words is "eleven million, three hundred seventy-three thousand, seven hundred eighty-one".