1318818809 has 24 divisors (see below), whose sum is σ = 1754169984. Its totient is φ = 967190400.

The previous prime is 1318818793. The next prime is 1318818859. The reversal of 1318818809 is 9088188131.

It is not a de Polignac number, because 1318818809 - 2⁴ = 1318818793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1318818859) 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 in 23 ways as a sum of consecutive naturals, for example, 31397 + ... + 60194.

It is an arithmetic number, because the mean of its divisors is an integer number (73090416).

Almost surely, 2^1318818809 is an apocalyptic number.

It is an amenable number.

1318818809 is a deficient number, since it is larger than the sum of its proper divisors (435351175).

1318818809 is a wasteful number, since it uses less digits than its factorization.

1318818809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91637 (or 91626 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 47.

The square root of 1318818809 is about 36315.5450048598. The cubic root of 1318818809 is about 1096.6340106108.

The spelling of 1318818809 in words is "one billion, three hundred eighteen million, eight hundred eighteen thousand, eight hundred nine".