11681729 has 2 divisors, whose sum is σ = 11681730. Its totient is φ = 11681728.

The previous prime is 11681717. The next prime is 11681731. The reversal of 11681729 is 92718611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 559504 = 3335^2 + 748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11681729 is a prime.

Together with 11681731, 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 (11681779) 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, 5840864 + 5840865.

It is an arithmetic number, because the mean of its divisors is an integer number (5840865).

Almost surely, 2^11681729 is an apocalyptic number.

It is an amenable number.

11681729 is a deficient number, since it is larger than the sum of its proper divisors (1).

11681729 is an equidigital number, since it uses as much as digits as its factorization.

11681729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 11681729 is about 3417.8544439458. The cubic root of 11681729 is about 226.9006337986.

The spelling of 11681729 in words is "eleven million, six hundred eighty-one thousand, seven hundred twenty-nine".