11915609 has 2 divisors, whose sum is σ = 11915610. Its totient is φ = 11915608.

The previous prime is 11915573. The next prime is 11915611. The reversal of 11915609 is 90651911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8248384 + 3667225 = 2872^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 11915609 - 2¹² = 11911513 is a prime.

Together with 11915611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11915639) 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, 5957804 + 5957805.

It is an arithmetic number, because the mean of its divisors is an integer number (5957805).

Almost surely, 2^11915609 is an apocalyptic number.

It is an amenable number.

11915609 is a deficient number, since it is larger than the sum of its proper divisors (1).

11915609 is an equidigital number, since it uses as much as digits as its factorization.

11915609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 11915609 is about 3451.8993322517. The cubic root of 11915609 is about 228.4048989209.

The spelling of 11915609 in words is "eleven million, nine hundred fifteen thousand, six hundred nine".