11777681 has 4 divisors (see below), whose sum is σ = 11827200. Its totient is φ = 11728164.

The previous prime is 11777677. The next prime is 11777687. The reversal of 11777681 is 18677711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11777681 - 2² = 11777677 is a prime.

It is a super-2 number, since 2×11777681² = 277427539475522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11777687) 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 3 ways as a sum of consecutive naturals, for example, 24401 + ... + 24878.

It is an arithmetic number, because the mean of its divisors is an integer number (2956800).

Almost surely, 2^11777681 is an apocalyptic number.

It is an amenable number.

11777681 is a deficient number, since it is larger than the sum of its proper divisors (49519).

11777681 is an equidigital number, since it uses as much as digits as its factorization.

11777681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49518.

The product of its digits is 16464, while the sum is 38.

The square root of 11777681 is about 3431.8626138003. The cubic root of 11777681 is about 227.5201833721.

The spelling of 11777681 in words is "eleven million, seven hundred seventy-seven thousand, six hundred eighty-one".