11891717 has 2 divisors, whose sum is σ = 11891718. Its totient is φ = 11891716.

The previous prime is 11891699. The next prime is 11891723. The reversal of 11891717 is 71719811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 776161 = 3334^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 11891717 - 2⁸ = 11891461 is a prime.

It is equal to p₇₈₁₃₉₇ and since 11891717 and 781397 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11891797) 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, 5945858 + 5945859.

It is an arithmetic number, because the mean of its divisors is an integer number (5945859).

Almost surely, 2^11891717 is an apocalyptic number.

It is an amenable number.

11891717 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891717 is an equidigital number, since it uses as much as digits as its factorization.

11891717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 35.

The square root of 11891717 is about 3448.4368922745. The cubic root of 11891717 is about 228.2521384752.

The spelling of 11891717 in words is "eleven million, eight hundred ninety-one thousand, seven hundred seventeen".