1801118917 has 8 divisors (see below), whose sum is σ = 1940069880. Its totient is φ = 1662225600.

The previous prime is 1801118911. The next prime is 1801118933. The reversal of 1801118917 is 7198111081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16394401 + 1784724516 = 4049^2 + 42246^2 .

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 1801118917 - 2¹¹ = 1801116869 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 (1801118911) 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, 67959 + ... + 90667.

It is an arithmetic number, because the mean of its divisors is an integer number (242508735).

Almost surely, 2^1801118917 is an apocalyptic number.

It is an amenable number.

1801118917 is a deficient number, since it is larger than the sum of its proper divisors (138950963).

1801118917 is a wasteful number, since it uses less digits than its factorization.

1801118917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28823.

The product of its (nonzero) digits is 4032, while the sum is 37.

The square root of 1801118917 is about 42439.5913858746. The cubic root of 1801118917 is about 1216.6924016908.

Adding to 1801118917 its reverse (7198111081), we get a palindrome (8999229998).

The spelling of 1801118917 in words is "one billion, eight hundred one million, one hundred eighteen thousand, nine hundred seventeen".