11963509 has 2 divisors, whose sum is σ = 11963510. Its totient is φ = 11963508.

The previous prime is 11963507. The next prime is 11963561. The reversal of 11963509 is 90536911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11902500 + 61009 = 3450^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 11963509 - 2¹ = 11963507 is a prime.

Together with 11963507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11963507) 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, 5981754 + 5981755.

It is an arithmetic number, because the mean of its divisors is an integer number (5981755).

Almost surely, 2^11963509 is an apocalyptic number.

It is an amenable number.

11963509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11963509 is an equidigital number, since it uses as much as digits as its factorization.

11963509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 11963509 is about 3458.8305827259. The cubic root of 11963509 is about 228.7105475074.

The spelling of 11963509 in words is "eleven million, nine hundred sixty-three thousand, five hundred nine".