11987609 has 2 divisors, whose sum is σ = 11987610. Its totient is φ = 11987608.

The previous prime is 11987579. The next prime is 11987611. The reversal of 11987609 is 90678911.

It is a happy number.

11987609 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11075584 + 912025 = 3328^2 + 955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11987609 is a prime.

Together with 11987611, 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 (11987629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993804 + 5993805.

It is an arithmetic number, because the mean of its divisors is an integer number (5993805).

Almost surely, 2^11987609 is an apocalyptic number.

It is an amenable number.

11987609 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987609 is an equidigital number, since it uses as much as digits as its factorization.

11987609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 11987609 is about 3462.3126664124. The cubic root of 11987609 is about 228.8640205157.

The spelling of 11987609 in words is "eleven million, nine hundred eighty-seven thousand, six hundred nine".