11821659 has 4 divisors (see below), whose sum is σ = 15762216. Its totient is φ = 7881104.

The previous prime is 11821643. The next prime is 11821661. The reversal of 11821659 is 95612811.

11821659 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11821659 - 2⁴ = 11821643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11821679) 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, 1970274 + ... + 1970279.

It is an arithmetic number, because the mean of its divisors is an integer number (3940554).

Almost surely, 2^11821659 is an apocalyptic number.

11821659 is a deficient number, since it is larger than the sum of its proper divisors (3940557).

11821659 is an equidigital number, since it uses as much as digits as its factorization.

11821659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940556.

The product of its digits is 4320, while the sum is 33.

The square root of 11821659 is about 3438.2639514732. The cubic root of 11821659 is about 227.8030193104.

The spelling of 11821659 in words is "eleven million, eight hundred twenty-one thousand, six hundred fifty-nine".