2118131641 has 4 divisors (see below), whose sum is σ = 2130815232. Its totient is φ = 2105448052.

The previous prime is 2118131629. The next prime is 2118131671. The reversal of 2118131641 is 1461318112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2118131641 - 2¹⁹ = 2117607353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118131671) 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, 6341545 + ... + 6341878.

It is an arithmetic number, because the mean of its divisors is an integer number (532703808).

Almost surely, 2^2118131641 is an apocalyptic number.

It is an amenable number.

2118131641 is a deficient number, since it is larger than the sum of its proper divisors (12683591).

2118131641 is a wasteful number, since it uses less digits than its factorization.

2118131641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12683590.

The product of its digits is 1152, while the sum is 28.

The square root of 2118131641 is about 46023.1641784873. The cubic root of 2118131641 is about 1284.2541642296.

Adding to 2118131641 its reverse (1461318112), we get a palindrome (3579449753).

The spelling of 2118131641 in words is "two billion, one hundred eighteen million, one hundred thirty-one thousand, six hundred forty-one".