11821969 has 2 divisors, whose sum is σ = 11821970. Its totient is φ = 11821968.

The previous prime is 11821967. The next prime is 11821991. The reversal of 11821969 is 96912811.

11821969 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 1993744 = 3135^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 11821969 - 2¹ = 11821967 is a prime.

It is a super-2 number, since 2×11821969² = 279517902073922, which contains 22 as substring.

Together with 11821967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11821961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5910984 + 5910985.

It is an arithmetic number, because the mean of its divisors is an integer number (5910985).

Almost surely, 2^11821969 is an apocalyptic number.

It is an amenable number.

11821969 is a deficient number, since it is larger than the sum of its proper divisors (1).

11821969 is an equidigital number, since it uses as much as digits as its factorization.

11821969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 37.

The square root of 11821969 is about 3438.3090320679. The cubic root of 11821969 is about 227.8050105232.

The spelling of 11821969 in words is "eleven million, eight hundred twenty-one thousand, nine hundred sixty-nine".