11617921 has 8 divisors (see below), whose sum is σ = 13855104. Its totient is φ = 9525120.

The previous prime is 11617913. The next prime is 11617933. The reversal of 11617921 is 12971611.

11617921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11617921 - 2³ = 11617913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11617921.

It is not an unprimeable number, because it can be changed into a prime (11617961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35920 + ... + 36241.

It is an arithmetic number, because the mean of its divisors is an integer number (1731888).

Almost surely, 2^11617921 is an apocalyptic number.

It is an amenable number.

11617921 is a deficient number, since it is larger than the sum of its proper divisors (2237183).

11617921 is an equidigital number, since it uses as much as digits as its factorization.

11617921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72191.

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

The square root of 11617921 is about 3408.5071512320. The cubic root of 11617921 is about 226.4867533800.

The spelling of 11617921 in words is "eleven million, six hundred seventeen thousand, nine hundred twenty-one".