1318447645 has 8 divisors (see below), whose sum is σ = 1583591256. Its totient is φ = 1053788736.

The previous prime is 1318447643. The next prime is 1318447649. The reversal of 1318447645 is 5467448131.

It can be written as a sum of positive squares in 4 ways, for example, as 697540921 + 620906724 = 26411^2 + 24918^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1318447645 - 2¹ = 1318447643 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 (1318447643) 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 7 ways as a sum of consecutive naturals, for example, 115162 + ... + 126091.

It is an arithmetic number, because the mean of its divisors is an integer number (197948907).

Almost surely, 2^1318447645 is an apocalyptic number.

It is an amenable number.

1318447645 is a deficient number, since it is larger than the sum of its proper divisors (265143611).

1318447645 is a wasteful number, since it uses less digits than its factorization.

1318447645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242351.

The product of its digits is 322560, while the sum is 43.

The square root of 1318447645 is about 36310.4343818688. The cubic root of 1318447645 is about 1096.5311232762.

The spelling of 1318447645 in words is "one billion, three hundred eighteen million, four hundred forty-seven thousand, six hundred forty-five".