2113955891 has 8 divisors (see below), whose sum is σ = 2171948064. Its totient is φ = 2056008960.

The previous prime is 2113955881. The next prime is 2113955923. The reversal of 2113955891 is 1985593112.

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 2113955891 - 2¹⁰ = 2113954867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2113955821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97571 + ... + 117251.

It is an arithmetic number, because the mean of its divisors is an integer number (271493508).

Almost surely, 2^2113955891 is an apocalyptic number.

2113955891 is a deficient number, since it is larger than the sum of its proper divisors (57992173).

2113955891 is a wasteful number, since it uses less digits than its factorization.

2113955891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22621.

The product of its digits is 97200, while the sum is 44.

The square root of 2113955891 is about 45977.7760553944. The cubic root of 2113955891 is about 1283.4096696182.

The spelling of 2113955891 in words is "two billion, one hundred thirteen million, nine hundred fifty-five thousand, eight hundred ninety-one".