2118171485 has 4 divisors (see below), whose sum is σ = 2541805788. Its totient is φ = 1694537184.

The previous prime is 2118171467. The next prime is 2118171511. The reversal of 2118171485 is 5841718112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 893591449 + 1224580036 = 29893^2 + 34994^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118171485 - 2⁶ = 2118171421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211817144 + ... + 211817153.

It is an arithmetic number, because the mean of its divisors is an integer number (635451447).

Almost surely, 2^2118171485 is an apocalyptic number.

It is an amenable number.

2118171485 is a deficient number, since it is larger than the sum of its proper divisors (423634303).

2118171485 is an equidigital number, since it uses as much as digits as its factorization.

2118171485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423634302.

The product of its digits is 17920, while the sum is 38.

The square root of 2118171485 is about 46023.5970454288. The cubic root of 2118171485 is about 1284.2622168456.

Adding to 2118171485 its reverse (5841718112), we get a palindrome (7959889597).

The spelling of 2118171485 in words is "two billion, one hundred eighteen million, one hundred seventy-one thousand, four hundred eighty-five".