11963621 has 4 divisors (see below), whose sum is σ = 11972652. Its totient is φ = 11954592.

The previous prime is 11963599. The next prime is 11963639. The reversal of 11963621 is 12636911.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 8673025 + 3290596 = 2945^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 11963621 - 2¹⁰ = 11962597 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 (11963641) 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, 2096 + ... + 5321.

It is an arithmetic number, because the mean of its divisors is an integer number (2993163).

Almost surely, 2^11963621 is an apocalyptic number.

It is an amenable number.

11963621 is a deficient number, since it is larger than the sum of its proper divisors (9031).

11963621 is an equidigital number, since it uses as much as digits as its factorization.

11963621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030.

The product of its digits is 1944, while the sum is 29.

The square root of 11963621 is about 3458.8467731312. The cubic root of 11963621 is about 228.7112612194.

The spelling of 11963621 in words is "eleven million, nine hundred sixty-three thousand, six hundred twenty-one".