11778161 has 8 divisors (see below), whose sum is σ = 12501864. Its totient is φ = 11057920.

The previous prime is 11778149. The next prime is 11778197. The reversal of 11778161 is 16187711.

It can be written as a sum of positive squares in 4 ways, for example, as 2512225 + 9265936 = 1585^2 + 3044^2 .

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 11778161 - 2⁶ = 11778097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11778101) 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 7 ways as a sum of consecutive naturals, for example, 10571 + ... + 11631.

It is an arithmetic number, because the mean of its divisors is an integer number (1562733).

Almost surely, 2^11778161 is an apocalyptic number.

It is an amenable number.

11778161 is a deficient number, since it is larger than the sum of its proper divisors (723703).

11778161 is a wasteful number, since it uses less digits than its factorization.

11778161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731.

The product of its digits is 2352, while the sum is 32.

The square root of 11778161 is about 3431.9325459572. The cubic root of 11778161 is about 227.5232741958.

The spelling of 11778161 in words is "eleven million, seven hundred seventy-eight thousand, one hundred sixty-one".