11841781 has 12 divisors (see below), whose sum is σ = 13984608. Its totient is φ = 9995832.

The previous prime is 11841779. The next prime is 11841793. The reversal of 11841781 is 18714811.

It is not a de Polignac number, because 11841781 - 2¹ = 11841779 is a prime.

It is a super-2 number, since 2×11841781² = 280455554503922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11841701) 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 in 11 ways as a sum of consecutive naturals, for example, 1480 + ... + 5086.

It is an arithmetic number, because the mean of its divisors is an integer number (1165384).

Almost surely, 2^11841781 is an apocalyptic number.

It is an amenable number.

11841781 is a deficient number, since it is larger than the sum of its proper divisors (2142827).

11841781 is an equidigital number, since it uses as much as digits as its factorization.

11841781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688 (or 3681 counting only the distinct ones).

The product of its digits is 1792, while the sum is 31.

The square root of 11841781 is about 3441.1888933914. The cubic root of 11841781 is about 227.9321961611.

The spelling of 11841781 in words is "eleven million, eight hundred forty-one thousand, seven hundred eighty-one".