11691217 has 4 divisors (see below), whose sum is σ = 11911860. Its totient is φ = 11470576.

The previous prime is 11691209. The next prime is 11691259. The reversal of 11691217 is 71219611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71219611 = 263 ⋅270797.

It can be written as a sum of positive squares in 2 ways, for example, as 10042561 + 1648656 = 3169^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 11691217 - 2³ = 11691209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11691917) 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 in 3 ways as a sum of consecutive naturals, for example, 110242 + ... + 110347.

It is an arithmetic number, because the mean of its divisors is an integer number (2977965).

Almost surely, 2^11691217 is an apocalyptic number.

It is an amenable number.

11691217 is a deficient number, since it is larger than the sum of its proper divisors (220643).

11691217 is an equidigital number, since it uses as much as digits as its factorization.

11691217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220642.

The product of its digits is 756, while the sum is 28.

The square root of 11691217 is about 3419.2421674985. The cubic root of 11691217 is about 226.9620473852.

The spelling of 11691217 in words is "eleven million, six hundred ninety-one thousand, two hundred seventeen".