1216758943 has 4 divisors (see below), whose sum is σ = 1221089328. Its totient is φ = 1212428560.

The previous prime is 1216758937. The next prime is 1216758967. The reversal of 1216758943 is 3498576121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3498576121 = 449 ⋅7791929.

It is a cyclic number.

It is not a de Polignac number, because 1216758943 - 2¹⁷ = 1216627871 is a prime.

It is a super-3 number, since 3×1216758943³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216758893 and 1216758902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216758343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2164771 + ... + 2165332.

It is an arithmetic number, because the mean of its divisors is an integer number (305272332).

Almost surely, 2^1216758943 is an apocalyptic number.

1216758943 is a deficient number, since it is larger than the sum of its proper divisors (4330385).

1216758943 is an equidigital number, since it uses as much as digits as its factorization.

1216758943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330384.

The product of its digits is 362880, while the sum is 46.

The square root of 1216758943 is about 34882.0719424750. The cubic root of 1216758943 is about 1067.5826708458.

The spelling of 1216758943 in words is "one billion, two hundred sixteen million, seven hundred fifty-eight thousand, nine hundred forty-three".