2113591 has 4 divisors (see below), whose sum is σ = 2165184. Its totient is φ = 2062000.

The previous prime is 2113583. The next prime is 2113603. The reversal of 2113591 is 1953112.

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

It is a cyclic number.

It is not a de Polignac number, because 2113591 - 2³ = 2113583 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25735 + ... + 25816.

It is an arithmetic number, because the mean of its divisors is an integer number (541296).

2^2113591 is an apocalyptic number.

2113591 is a deficient number, since it is larger than the sum of its proper divisors (51593).

2113591 is an equidigital number, since it uses as much as digits as its factorization.

2113591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51592.

The product of its digits is 270, while the sum is 22.

The square root of 2113591 is about 1453.8194523393. The cubic root of 2113591 is about 128.3335822037. Note that the first 3 decimals are identical.

It can be divided in two parts, 2113 and 591, that added together give a square (2704 = 52²).

The spelling of 2113591 in words is "two million, one hundred thirteen thousand, five hundred ninety-one".