2185831 has 4 divisors (see below), whose sum is σ = 2191072. Its totient is φ = 2180592.

The previous prime is 2185801. The next prime is 2185853. The reversal of 2185831 is 1385812.

2185831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2185831 is a prime.

It is a super-2 number, since 2×2185831² = 9555714321122, which contains 22 as substring.

It is a Duffinian number.

2185831 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2185831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1935 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (547768).

2^2185831 is an apocalyptic number.

2185831 is a deficient number, since it is larger than the sum of its proper divisors (5241).

2185831 is an equidigital number, since it uses as much as digits as its factorization.

2185831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5240.

The product of its digits is 1920, while the sum is 28.

The square root of 2185831 is about 1478.4556131315. The cubic root of 2185831 is about 129.7793297744.

The spelling of 2185831 in words is "two million, one hundred eighty-five thousand, eight hundred thirty-one".