11913621 has 4 divisors (see below), whose sum is σ = 15884832. Its totient is φ = 7942412.

The previous prime is 11913619. The next prime is 11913647. The reversal of 11913621 is 12631911.

11913621 is digitally balanced in base 3, 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.

It is a cyclic number.

It is not a de Polignac number, because 11913621 - 2¹ = 11913619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11913591 and 11913600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11913611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985601 + ... + 1985606.

It is an arithmetic number, because the mean of its divisors is an integer number (3971208).

Almost surely, 2^11913621 is an apocalyptic number.

It is an amenable number.

11913621 is a deficient number, since it is larger than the sum of its proper divisors (3971211).

11913621 is an equidigital number, since it uses as much as digits as its factorization.

11913621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971210.

The product of its digits is 324, while the sum is 24.

The square root of 11913621 is about 3451.6113628275. The cubic root of 11913621 is about 228.3921958580.

The spelling of 11913621 in words is "eleven million, nine hundred thirteen thousand, six hundred twenty-one".