2185281 has 12 divisors (see below), whose sum is σ = 3607552. Its totient is φ = 1248696.

The previous prime is 2185279. The next prime is 2185291. The reversal of 2185281 is 1825812.

It is not a de Polignac number, because 2185281 - 2¹ = 2185279 is a prime.

It is a super-2 number, since 2×2185281² = 9550906097922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2185201) 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 11 ways as a sum of consecutive naturals, for example, 17281 + ... + 17406.

2^2185281 is an apocalyptic number.

2185281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2185281 is a deficient number, since it is larger than the sum of its proper divisors (1422271).

2185281 is a wasteful number, since it uses less digits than its factorization.

2185281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34700 (or 34697 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2185281 is about 1478.2695965216. The cubic root of 2185281 is about 129.7684438124.

The spelling of 2185281 in words is "two million, one hundred eighty-five thousand, two hundred eighty-one".