2185851 has 16 divisors (see below), whose sum is σ = 3087360. Its totient is φ = 1372800.

The previous prime is 2185801. The next prime is 2185853. The reversal of 2185851 is 1585812.

It is not a de Polignac number, because 2185851 - 2⁷ = 2185723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2185853) 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, 5251 + ... + 5651.

It is an arithmetic number, because the mean of its divisors is an integer number (192960).

2^2185851 is an apocalyptic number.

2185851 is a deficient number, since it is larger than the sum of its proper divisors (901509).

2185851 is a wasteful number, since it uses less digits than its factorization.

2185851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506.

The product of its digits is 3200, while the sum is 30.

The square root of 2185851 is about 1478.4623769308. The cubic root of 2185851 is about 129.7797255931.

The spelling of 2185851 in words is "two million, one hundred eighty-five thousand, eight hundred fifty-one".