11887517 has 2 divisors, whose sum is σ = 11887518. Its totient is φ = 11887516.

The previous prime is 11887511. The next prime is 11887541. The reversal of 11887517 is 71578811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6180196 + 5707321 = 2486^2 + 2389^2 .

It is an emirp because it is prime and its reverse (71578811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11887517 - 2⁶ = 11887453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11887511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5943758 + 5943759.

It is an arithmetic number, because the mean of its divisors is an integer number (5943759).

Almost surely, 2^11887517 is an apocalyptic number.

It is an amenable number.

11887517 is a deficient number, since it is larger than the sum of its proper divisors (1).

11887517 is an equidigital number, since it uses as much as digits as its factorization.

11887517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 38.

The square root of 11887517 is about 3447.8278669330. The cubic root of 11887517 is about 228.2252634140.

The spelling of 11887517 in words is "eleven million, eight hundred eighty-seven thousand, five hundred seventeen".