2113118281 has 4 divisors (see below), whose sum is σ = 2113300372. Its totient is φ = 2112936192.

The previous prime is 2113118251. The next prime is 2113118291. The reversal of 2113118281 is 1828113112.

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 1018567225 + 1094551056 = 31915^2 + 33084^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113118281 - 2⁷ = 2113118153 is a prime.

It is a super-2 number, since 2×2113118281² = 8930537738992789922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2113118201) 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 3 ways as a sum of consecutive naturals, for example, 72360 + ... + 97273.

It is an arithmetic number, because the mean of its divisors is an integer number (528325093).

Almost surely, 2^2113118281 is an apocalyptic number.

It is an amenable number.

2113118281 is a deficient number, since it is larger than the sum of its proper divisors (182091).

2113118281 is a wasteful number, since it uses less digits than its factorization.

2113118281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182090.

The product of its digits is 768, while the sum is 28.

The square root of 2113118281 is about 45968.6662956410. Note that the first 3 decimals coincide. The cubic root of 2113118281 is about 1283.2401393093.

The spelling of 2113118281 in words is "two billion, one hundred thirteen million, one hundred eighteen thousand, two hundred eighty-one".