11456509 has 2 divisors, whose sum is σ = 11456510. Its totient is φ = 11456508.

The previous prime is 11456477. The next prime is 11456513. The reversal of 11456509 is 90565411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9272025 + 2184484 = 3045^2 + 1478^2 .

It is an emirp because it is prime and its reverse (90565411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11456509 - 2⁵ = 11456477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11456539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5728254 + 5728255.

It is an arithmetic number, because the mean of its divisors is an integer number (5728255).

Almost surely, 2^11456509 is an apocalyptic number.

It is an amenable number.

11456509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11456509 is an equidigital number, since it uses as much as digits as its factorization.

11456509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 11456509 is about 3384.7465193128. The cubic root of 11456509 is about 225.4329704102.

The spelling of 11456509 in words is "eleven million, four hundred fifty-six thousand, five hundred nine".