11781161 has 8 divisors (see below), whose sum is σ = 13751040. Its totient is φ = 9883008.

The previous prime is 11781157. The next prime is 11781167. The reversal of 11781161 is 16118711.

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 11781161 - 2² = 11781157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11781161.

It is not an unprimeable number, because it can be changed into a prime (11781167) 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 7 ways as a sum of consecutive naturals, for example, 17576 + ... + 18233.

It is an arithmetic number, because the mean of its divisors is an integer number (1718880).

Almost surely, 2^11781161 is an apocalyptic number.

It is an amenable number.

11781161 is a deficient number, since it is larger than the sum of its proper divisors (1969879).

11781161 is an equidigital number, since it uses as much as digits as its factorization.

11781161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35863.

The product of its digits is 336, while the sum is 26.

The square root of 11781161 is about 3432.3695896567. The cubic root of 11781161 is about 227.5425899412.

Adding to 11781161 its reverse (16118711), we get a palindrome (27899872).

The spelling of 11781161 in words is "eleven million, seven hundred eighty-one thousand, one hundred sixty-one".