11720171 has 4 divisors (see below), whose sum is σ = 11727072. Its totient is φ = 11713272.

The previous prime is 11720153. The next prime is 11720197. The reversal of 11720171 is 17102711.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17102711 = 3467 ⋅4933.

It is a cyclic number.

It is not a de Polignac number, because 11720171 - 2²² = 7525867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11720671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (2931768).

Almost surely, 2^11720171 is an apocalyptic number.

11720171 is a deficient number, since it is larger than the sum of its proper divisors (6901).

11720171 is an equidigital number, since it uses as much as digits as its factorization.

11720171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 11720171 is about 3423.4735284503. The cubic root of 11720171 is about 227.1492546338.

Adding to 11720171 its reverse (17102711), we get a palindrome (28822882).

The spelling of 11720171 in words is "eleven million, seven hundred twenty thousand, one hundred seventy-one".