11285781 has 24 divisors (see below), whose sum is σ = 16683744. Its totient is φ = 6745440.

The previous prime is 11285779. The next prime is 11285809. The reversal of 11285781 is 18758211.

It is not a de Polignac number, because 11285781 - 2¹ = 11285779 is a prime.

It is a super-2 number, since 2×11285781² = 254737705559922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11285711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86086 + ... + 86216.

It is an arithmetic number, because the mean of its divisors is an integer number (695156).

Almost surely, 2^11285781 is an apocalyptic number.

It is an amenable number.

11285781 is a deficient number, since it is larger than the sum of its proper divisors (5397963).

11285781 is a wasteful number, since it uses less digits than its factorization.

11285781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 194 counting only the distinct ones).

The product of its digits is 4480, while the sum is 33.

The square root of 11285781 is about 3359.4316483596. The cubic root of 11285781 is about 224.3075402084.

The spelling of 11285781 in words is "eleven million, two hundred eighty-five thousand, seven hundred eighty-one".