11781121 has 8 divisors (see below), whose sum is σ = 13528800. Its totient is φ = 10146240.

The previous prime is 11781089. The next prime is 11781139. The reversal of 11781121 is 12118711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11781121 - 2⁵ = 11781089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11781092 and 11781101.

It is not an unprimeable number, because it can be changed into a prime (11781181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27976 + ... + 28393.

It is an arithmetic number, because the mean of its divisors is an integer number (1691100).

Almost surely, 2^11781121 is an apocalyptic number.

11781121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11781121 is a deficient number, since it is larger than the sum of its proper divisors (1747679).

11781121 is a wasteful number, since it uses less digits than its factorization.

11781121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56399.

The product of its digits is 112, while the sum is 22.

The square root of 11781121 is about 3432.3637627734. The cubic root of 11781121 is about 227.5423324195.

Adding to 11781121 its reverse (12118711), we get a palindrome (23899832).

The spelling of 11781121 in words is "eleven million, seven hundred eighty-one thousand, one hundred twenty-one".