11987719 has 2 divisors, whose sum is σ = 11987720. Its totient is φ = 11987718.

The previous prime is 11987687. The next prime is 11987743. The reversal of 11987719 is 91778911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11987719 - 2⁵ = 11987687 is a prime.

It is a super-2 number, since 2×11987719² = 287410813645922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11987779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993859 + 5993860.

It is an arithmetic number, because the mean of its divisors is an integer number (5993860).

Almost surely, 2^11987719 is an apocalyptic number.

11987719 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987719 is an equidigital number, since it uses as much as digits as its factorization.

11987719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 43.

The square root of 11987719 is about 3462.3285517120. The cubic root of 11987719 is about 228.8647205432.

The spelling of 11987719 in words is "eleven million, nine hundred eighty-seven thousand, seven hundred nineteen".