11887919 has 2 divisors, whose sum is σ = 11887920. Its totient is φ = 11887918.

The previous prime is 11887891. The next prime is 11887921. The reversal of 11887919 is 91978811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11887919 - 2²⁰ = 10839343 is a prime.

It is a super-2 number, since 2×11887919² = 282645236301122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 11887921, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11887919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11887949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5943959 + 5943960.

It is an arithmetic number, because the mean of its divisors is an integer number (5943960).

Almost surely, 2^11887919 is an apocalyptic number.

11887919 is a deficient number, since it is larger than the sum of its proper divisors (1).

11887919 is an equidigital number, since it uses as much as digits as its factorization.

11887919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 44.

The square root of 11887919 is about 3447.8861640141. The cubic root of 11887919 is about 228.2278360152.

The spelling of 11887919 in words is "eleven million, eight hundred eighty-seven thousand, nine hundred nineteen".