11861917 has 2 divisors, whose sum is σ = 11861918. Its totient is φ = 11861916.

The previous prime is 11861887. The next prime is 11861921. The reversal of 11861917 is 71916811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6937956 + 4923961 = 2634^2 + 2219^2 .

It is a cyclic number.

It is not a de Polignac number, because 11861917 - 2¹⁵ = 11829149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11861987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5930958 + 5930959.

It is an arithmetic number, because the mean of its divisors is an integer number (5930959).

Almost surely, 2^11861917 is an apocalyptic number.

It is an amenable number.

11861917 is a deficient number, since it is larger than the sum of its proper divisors (1).

11861917 is an equidigital number, since it uses as much as digits as its factorization.

11861917 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11861917 is about 3444.1133837317. The cubic root of 11861917 is about 228.0613164828.

The spelling of 11861917 in words is "eleven million, eight hundred sixty-one thousand, nine hundred seventeen".