2785281 has 4 divisors (see below), whose sum is σ = 3713712. Its totient is φ = 1856852.

The previous prime is 2785273. The next prime is 2785301. The reversal of 2785281 is 1825872.

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 cyclic number.

It is not a de Polignac number, because 2785281 - 2³ = 2785273 is a prime.

It is a super-2 number, since 2×2785281² = 15515580497922, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2785201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464211 + ... + 464216.

It is an arithmetic number, because the mean of its divisors is an integer number (928428).

It is a Proth number, since it is equal to 85 ⋅ 2¹⁵ + 1 and 85 < 2¹⁵.

2^2785281 is an apocalyptic number.

It is an amenable number.

2785281 is a deficient number, since it is larger than the sum of its proper divisors (928431).

2785281 is an equidigital number, since it uses as much as digits as its factorization.

2785281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928430.

The product of its digits is 8960, while the sum is 33.

The square root of 2785281 is about 1668.9161153275. The cubic root of 2785281 is about 140.6985663474.

The spelling of 2785281 in words is "two million, seven hundred eighty-five thousand, two hundred eighty-one".