2105311 has 4 divisors (see below), whose sum is σ = 2267272. Its totient is φ = 1943352.

The previous prime is 2105287. The next prime is 2105317. The reversal of 2105311 is 1135012.

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 2105311 - 2⁷ = 2105183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 161947 = 2105311 / (2 + 1 + 0 + 5 + 3 + 1 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2105291 and 2105300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105317) 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 3 ways as a sum of consecutive naturals, for example, 80961 + ... + 80986.

It is an arithmetic number, because the mean of its divisors is an integer number (566818).

2^2105311 is an apocalyptic number.

2105311 is a deficient number, since it is larger than the sum of its proper divisors (161961).

2105311 is a wasteful number, since it uses less digits than its factorization.

2105311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161960.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 2105311 is about 1450.9689865741. The cubic root of 2105311 is about 128.1657804750.

Subtracting from 2105311 its reverse (1135012), we obtain a cube (970299 = 99³).

The spelling of 2105311 in words is "two million, one hundred five thousand, three hundred eleven".