1216758493 has 16 divisors (see below), whose sum is σ = 1301408640. Its totient is φ = 1137559488.

The previous prime is 1216758469. The next prime is 1216758497. The reversal of 1216758493 is 3948576121.

It is a de Polignac number, because none of the positive numbers 2^k-1216758493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216758497) 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 15 ways as a sum of consecutive naturals, for example, 819730 + ... + 821212.

It is an arithmetic number, because the mean of its divisors is an integer number (81338040).

Almost surely, 2^1216758493 is an apocalyptic number.

It is an amenable number.

1216758493 is a deficient number, since it is larger than the sum of its proper divisors (84650147).

1216758493 is an equidigital number, since it uses as much as digits as its factorization.

1216758493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 1667 counting only the distinct ones).

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

The square root of 1216758493 is about 34882.0654921695. The cubic root of 1216758493 is about 1067.5825392360.

The spelling of 1216758493 in words is "one billion, two hundred sixteen million, seven hundred fifty-eight thousand, four hundred ninety-three".