2108281 has 4 divisors (see below), whose sum is σ = 2409472. Its totient is φ = 1807092.

The previous prime is 2108263. The next prime is 2108291. The reversal of 2108281 is 1828012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-2108281 is a prime.

It is a super-2 number, since 2×2108281² = 8889697549922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2108231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150585 + ... + 150598.

It is an arithmetic number, because the mean of its divisors is an integer number (602368).

2^2108281 is an apocalyptic number.

It is an amenable number.

2108281 is a deficient number, since it is larger than the sum of its proper divisors (301191).

2108281 is an equidigital number, since it uses as much as digits as its factorization.

2108281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301190.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 2108281 is about 1451.9920798682. The cubic root of 2108281 is about 128.2260207452.

The spelling of 2108281 in words is "two million, one hundred eight thousand, two hundred eighty-one".