11721717 has 24 divisors (see below), whose sum is σ = 19646016. Its totient is φ = 6595776.

The previous prime is 11721691. The next prime is 11721733. The reversal of 11721717 is 71712711.

It is not a de Polignac number, because 11721717 - 2¹⁰ = 11720693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721767) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2833 + ... + 5609.

It is an arithmetic number, because the mean of its divisors is an integer number (818584).

Almost surely, 2^11721717 is an apocalyptic number.

It is an amenable number.

11721717 is a deficient number, since it is larger than the sum of its proper divisors (7924299).

11721717 is a wasteful number, since it uses less digits than its factorization.

11721717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857 (or 2854 counting only the distinct ones).

The product of its digits is 686, while the sum is 27.

The square root of 11721717 is about 3423.6993150684. The cubic root of 11721717 is about 227.1592418973.

The spelling of 11721717 in words is "eleven million, seven hundred twenty-one thousand, seven hundred seventeen".