1218713311493 has 2 divisors, whose sum is σ = 1218713311494. Its totient is φ = 1218713311492.

The previous prime is 1218713311483. The next prime is 1218713311507. The reversal of 1218713311493 is 3941133178121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 891509863204 + 327203448289 = 944198^2 + 572017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218713311493 - 2⁴ = 1218713311477 is a prime.

It is a super-2 number, since 2×1218713311493² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218713311483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609356655746 + 609356655747.

It is an arithmetic number, because the mean of its divisors is an integer number (609356655747).

Almost surely, 2^{1218713311493} is an apocalyptic number.

It is an amenable number.

1218713311493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218713311493 is an equidigital number, since it uses as much as digits as its factorization.

1218713311493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The spelling of 1218713311493 in words is "one trillion, two hundred eighteen billion, seven hundred thirteen million, three hundred eleven thousand, four hundred ninety-three".