11819761 has 4 divisors (see below), whose sum is σ = 12139252. Its totient is φ = 11500272.

The previous prime is 11819749. The next prime is 11819779. The reversal of 11819761 is 16791811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16791811 = 179 ⋅93809.

It can be written as a sum of positive squares in 2 ways, for example, as 5664400 + 6155361 = 2380^2 + 2481^2 .

It is a cyclic number.

It is not a de Polignac number, because 11819761 - 2¹⁵ = 11786993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11819161) 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, 159690 + ... + 159763.

It is an arithmetic number, because the mean of its divisors is an integer number (3034813).

Almost surely, 2^11819761 is an apocalyptic number.

It is an amenable number.

11819761 is a deficient number, since it is larger than the sum of its proper divisors (319491).

11819761 is an equidigital number, since it uses as much as digits as its factorization.

11819761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319490.

The product of its digits is 3024, while the sum is 34.

The square root of 11819761 is about 3437.9879290073. The cubic root of 11819761 is about 227.7908271899.

The spelling of 11819761 in words is "eleven million, eight hundred nineteen thousand, seven hundred sixty-one".