11621917 has 4 divisors (see below), whose sum is σ = 11632896. Its totient is φ = 11610940.

The previous prime is 11621873. The next prime is 11621921. The reversal of 11621917 is 71912611.

11621917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 71912611 = 83 ⋅866417.

It is a cyclic number.

It is not a de Polignac number, because 11621917 - 2¹¹ = 11619869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621957) 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, 3709 + ... + 6082.

It is an arithmetic number, because the mean of its divisors is an integer number (2908224).

Almost surely, 2^11621917 is an apocalyptic number.

It is an amenable number.

11621917 is a deficient number, since it is larger than the sum of its proper divisors (10979).

11621917 is an equidigital number, since it uses as much as digits as its factorization.

11621917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10978.

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

The square root of 11621917 is about 3409.0932812113. The cubic root of 11621917 is about 226.5127172142.

The spelling of 11621917 in words is "eleven million, six hundred twenty-one thousand, nine hundred seventeen".