2118049691 has 4 divisors (see below), whose sum is σ = 2210138832. Its totient is φ = 2025960552.

The previous prime is 2118049663. The next prime is 2118049711. The reversal of 2118049691 is 1969408112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2118049691 is a prime.

It is a super-3 number, since 3×2118049691³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118049621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46044536 + ... + 46044581.

It is an arithmetic number, because the mean of its divisors is an integer number (552534708).

Almost surely, 2^2118049691 is an apocalyptic number.

2118049691 is a deficient number, since it is larger than the sum of its proper divisors (92089141).

2118049691 is an equidigital number, since it uses as much as digits as its factorization.

2118049691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92089140.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 2118049691 is about 46022.2738573400. The cubic root of 2118049691 is about 1284.2376015219.

The spelling of 2118049691 in words is "two billion, one hundred eighteen million, forty-nine thousand, six hundred ninety-one".