1118701809 has 9 divisors (see below), whose sum is σ = 1616047563. Its totient is φ = 745734312.

The previous prime is 1118701781. The next prime is 1118701811. The reversal of 1118701809 is 9081078111.

It is a happy number.

The square root of 1118701809 is 33447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 340291809 + 778410000 = 18447^2 + 27900^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1118701809 - 2⁵ = 1118701777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1118701009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 94767 + ... + 105915.

Almost surely, 2^1118701809 is an apocalyptic number.

1118701809 is the 33447-th square number.

1118701809 is the 16724-th centered octagonal number.

It is an amenable number.

1118701809 is a deficient number, since it is larger than the sum of its proper divisors (497345754).

1118701809 is an frugal number, since it uses more digits than its factorization.

1118701809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22304 (or 11152 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 36.

The cubic root of 1118701809 is about 1038.0974242258.

Multiplying 1118701809 by its sum of digits (36), we get a square (40273265124 = 200682²).

The spelling of 1118701809 in words is "one billion, one hundred eighteen million, seven hundred one thousand, eight hundred nine".