11781761 has 2 divisors, whose sum is σ = 11781762. Its totient is φ = 11781760.

The previous prime is 11781733. The next prime is 11781787. The reversal of 11781761 is 16718711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 10000 = 3431^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 11781761 - 2¹⁰ = 11780737 is a prime.

It is a super-2 number, since 2×11781761² = 277619784522242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11781361) 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 as a sum of consecutive naturals, namely, 5890880 + 5890881.

It is an arithmetic number, because the mean of its divisors is an integer number (5890881).

Almost surely, 2^11781761 is an apocalyptic number.

It is an amenable number.

11781761 is a deficient number, since it is larger than the sum of its proper divisors (1).

11781761 is an equidigital number, since it uses as much as digits as its factorization.

11781761 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11781761 is about 3432.4569917189. The cubic root of 11781761 is about 227.5464526968.

The spelling of 11781761 in words is "eleven million, seven hundred eighty-one thousand, seven hundred sixty-one".