2105831 has 16 divisors (see below), whose sum is σ = 2635584. Its totient is φ = 1638144.

The previous prime is 2105819. The next prime is 2105833. The reversal of 2105831 is 1385012.

It is a cyclic number.

It is not a de Polignac number, because 2105831 - 2⁶ = 2105767 is a prime.

It is a super-2 number, since 2×2105831² = 8869048401122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6485 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (164724).

2^2105831 is an apocalyptic number.

2105831 is a deficient number, since it is larger than the sum of its proper divisors (529753).

2105831 is a wasteful number, since it uses less digits than its factorization.

2105831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2105831 is about 1451.1481661085. The cubic root of 2105831 is about 128.1763316825.

The spelling of 2105831 in words is "two million, one hundred five thousand, eight hundred thirty-one".