11891617 has 2 divisors, whose sum is σ = 11891618. Its totient is φ = 11891616.

The previous prime is 11891603. The next prime is 11891623. The reversal of 11891617 is 71619811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11532816 + 358801 = 3396^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 11891617 - 2¹¹ = 11889569 is a prime.

It is not a weakly prime, because it can be changed into another prime (11891657) 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, 5945808 + 5945809.

It is an arithmetic number, because the mean of its divisors is an integer number (5945809).

Almost surely, 2^11891617 is an apocalyptic number.

It is an amenable number.

11891617 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891617 is an equidigital number, since it uses as much as digits as its factorization.

11891617 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 11891617 is about 3448.4223929211. The cubic root of 11891617 is about 228.2514986663.

The spelling of 11891617 in words is "eleven million, eight hundred ninety-one thousand, six hundred seventeen".