2118893691 has 8 divisors (see below), whose sum is σ = 2846758464. Its totient is φ = 1401812360.

The previous prime is 2118893677. The next prime is 2118893701. The reversal of 2118893691 is 1963988112.

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 2118893691 - 2⁷ = 2118893563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2118893691.

It is not an unprimeable number, because it can be changed into a prime (2118894691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2695401 + ... + 2696186.

It is an arithmetic number, because the mean of its divisors is an integer number (355844808).

Almost surely, 2^2118893691 is an apocalyptic number.

2118893691 is a deficient number, since it is larger than the sum of its proper divisors (727864773).

2118893691 is a wasteful number, since it uses less digits than its factorization.

2118893691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391721.

The product of its digits is 186624, while the sum is 48.

The square root of 2118893691 is about 46031.4424171131. The cubic root of 2118893691 is about 1284.4081597799.

The spelling of 2118893691 in words is "two billion, one hundred eighteen million, eight hundred ninety-three thousand, six hundred ninety-one".