11445209 has 2 divisors, whose sum is σ = 11445210. Its totient is φ = 11445208.

The previous prime is 11445197. The next prime is 11445211. The reversal of 11445209 is 90254411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 4305625 = 2672^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 11445209 - 2¹² = 11441113 is a prime.

Together with 11445211, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₇₅₃₉₀₂ and since 11445209 and 753902 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (11445289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5722604 + 5722605.

It is an arithmetic number, because the mean of its divisors is an integer number (5722605).

Almost surely, 2^11445209 is an apocalyptic number.

It is an amenable number.

11445209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11445209 is an equidigital number, since it uses as much as digits as its factorization.

11445209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 11445209 is about 3383.0768539896. The cubic root of 11445209 is about 225.3588282623.

The spelling of 11445209 in words is "eleven million, four hundred forty-five thousand, two hundred nine".