11775681 has 12 divisors (see below), whose sum is σ = 17175808. Its totient is φ = 7773624.

The previous prime is 11775677. The next prime is 11775683. The reversal of 11775681 is 18657711.

It is a happy number.

It is not a de Polignac number, because 11775681 - 2² = 11775677 is a prime.

It is a super-2 number, since 2×11775681² = 277333326027522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11775683) 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, 5425 + ... + 7278.

Almost surely, 2^11775681 is an apocalyptic number.

It is an amenable number.

11775681 is a deficient number, since it is larger than the sum of its proper divisors (5400127).

11775681 is a wasteful number, since it uses less digits than its factorization.

11775681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12812 (or 12809 counting only the distinct ones).

The product of its digits is 11760, while the sum is 36.

The square root of 11775681 is about 3431.5712144730. The cubic root of 11775681 is about 227.5073040363.

The spelling of 11775681 in words is "eleven million, seven hundred seventy-five thousand, six hundred eighty-one".