1318820984509 has 16 divisors (see below), whose sum is σ = 1541580046848. Its totient is φ = 1104722422272.

The previous prime is 1318820984489. The next prime is 1318820984513. The reversal of 1318820984509 is 9054890288131.

It is a de Polignac number, because none of the positive numbers 2^k-1318820984509 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 (1318820984809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2756722 + ... + 3199555.

It is an arithmetic number, because the mean of its divisors is an integer number (96348752928).

Almost surely, 2^{1318820984509} is an apocalyptic number.

It is an amenable number.

1318820984509 is a deficient number, since it is larger than the sum of its proper divisors (222759062339).

1318820984509 is an equidigital number, since it uses as much as digits as its factorization.

1318820984509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957004.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 1318820984509 in words is "one trillion, three hundred eighteen billion, eight hundred twenty million, nine hundred eighty-four thousand, five hundred nine".