1318217843 has 2 divisors, whose sum is σ = 1318217844. Its totient is φ = 1318217842.

The previous prime is 1318217821. The next prime is 1318217903. The reversal of 1318217843 is 3487128131.

It is a weak prime.

It is an emirp because it is prime and its reverse (3487128131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1318217843 - 2¹⁰ = 1318216819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1318217797 and 1318217806.

It is not a weakly prime, because it can be changed into another prime (1318217143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659108921 + 659108922.

It is an arithmetic number, because the mean of its divisors is an integer number (659108922).

Almost surely, 2^1318217843 is an apocalyptic number.

1318217843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318217843 is an equidigital number, since it uses as much as digits as its factorization.

1318217843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 1318217843 is about 36307.2698367696. The cubic root of 1318217843 is about 1096.4674120656.

The spelling of 1318217843 in words is "one billion, three hundred eighteen million, two hundred seventeen thousand, eight hundred forty-three".