11409821 has 2 divisors, whose sum is σ = 11409822. Its totient is φ = 11409820.

The previous prime is 11409803. The next prime is 11409841. The reversal of 11409821 is 12890411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 2325625 = 3014^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 11409821 - 2⁶ = 11409757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11409841) 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 as a sum of consecutive naturals, namely, 5704910 + 5704911.

It is an arithmetic number, because the mean of its divisors is an integer number (5704911).

Almost surely, 2^11409821 is an apocalyptic number.

It is an amenable number.

11409821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11409821 is an equidigital number, since it uses as much as digits as its factorization.

11409821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 11409821 is about 3377.8426547132. The cubic root of 11409821 is about 225.1263224807.

The spelling of 11409821 in words is "eleven million, four hundred nine thousand, eight hundred twenty-one".