1318042243 has 4 divisors (see below), whose sum is σ = 1506334000. Its totient is φ = 1129750488.

The previous prime is 1318042183. The next prime is 1318042259. The reversal of 1318042243 is 3422408131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1318042243 - 2²¹ = 1315945091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318012243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94145868 + ... + 94145881.

It is an arithmetic number, because the mean of its divisors is an integer number (376583500).

Almost surely, 2^1318042243 is an apocalyptic number.

1318042243 is a deficient number, since it is larger than the sum of its proper divisors (188291757).

1318042243 is an equidigital number, since it uses as much as digits as its factorization.

1318042243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188291756.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1318042243 is about 36304.8515077531. The cubic root of 1318042243 is about 1096.4187230398.

The spelling of 1318042243 in words is "one billion, three hundred eighteen million, forty-two thousand, two hundred forty-three".