11281909 has 2 divisors, whose sum is σ = 11281910. Its totient is φ = 11281908.

The previous prime is 11281903. The next prime is 11281913. The reversal of 11281909 is 90918211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10909809 + 372100 = 3303^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 11281909 - 2³ = 11281901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11281901) 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, 5640954 + 5640955.

It is an arithmetic number, because the mean of its divisors is an integer number (5640955).

Almost surely, 2^11281909 is an apocalyptic number.

It is an amenable number.

11281909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11281909 is an equidigital number, since it uses as much as digits as its factorization.

11281909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 11281909 is about 3358.8553109653. The cubic root of 11281909 is about 224.2818849720.

The spelling of 11281909 in words is "eleven million, two hundred eighty-one thousand, nine hundred nine".