11781659 has 2 divisors, whose sum is σ = 11781660. Its totient is φ = 11781658.

The previous prime is 11781647. The next prime is 11781661. The reversal of 11781659 is 95618711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11781659 - 2¹⁶ = 11716123 is a prime.

Together with 11781661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11781619) 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 as a sum of consecutive naturals, namely, 5890829 + 5890830.

It is an arithmetic number, because the mean of its divisors is an integer number (5890830).

Almost surely, 2^11781659 is an apocalyptic number.

11781659 is a deficient number, since it is larger than the sum of its proper divisors (1).

11781659 is an equidigital number, since it uses as much as digits as its factorization.

11781659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 11781659 is about 3432.4421335253. The cubic root of 11781659 is about 227.5457960376.

The spelling of 11781659 in words is "eleven million, seven hundred eighty-one thousand, six hundred fifty-nine".