11981719 has 4 divisors (see below), whose sum is σ = 12686544. Its totient is φ = 11276896.

The previous prime is 11981713. The next prime is 11981743. The reversal of 11981719 is 91718911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91718911 = 463 ⋅198097.

It is a cyclic number.

It is not a de Polignac number, because 11981719 - 2¹⁹ = 11457431 is a prime.

It is a super-2 number, since 2×11981719² = 287123180389922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352387 + ... + 352420.

It is an arithmetic number, because the mean of its divisors is an integer number (3171636).

Almost surely, 2^11981719 is an apocalyptic number.

11981719 is a deficient number, since it is larger than the sum of its proper divisors (704825).

11981719 is an equidigital number, since it uses as much as digits as its factorization.

11981719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704824.

The product of its digits is 4536, while the sum is 37.

The square root of 11981719 is about 3461.4619743686. The cubic root of 11981719 is about 228.8265309736.

The spelling of 11981719 in words is "eleven million, nine hundred eighty-one thousand, seven hundred nineteen".