1318734561 has 16 divisors (see below), whose sum is σ = 1795263680. Its totient is φ = 860855040.

The previous prime is 1318734559. The next prime is 1318734629. The reversal of 1318734561 is 1654378131.

It is not a de Polignac number, because 1318734561 - 2¹ = 1318734559 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318734511) 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, 8781 + ... + 52101.

It is an arithmetic number, because the mean of its divisors is an integer number (112203980).

Almost surely, 2^1318734561 is an apocalyptic number.

It is an amenable number.

1318734561 is a deficient number, since it is larger than the sum of its proper divisors (476529119).

1318734561 is a wasteful number, since it uses less digits than its factorization.

1318734561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43536.

The product of its digits is 60480, while the sum is 39.

The square root of 1318734561 is about 36314.3850422942. The cubic root of 1318734561 is about 1096.6106586060.

The spelling of 1318734561 in words is "one billion, three hundred eighteen million, seven hundred thirty-four thousand, five hundred sixty-one".