2104781 has 4 divisors (see below), whose sum is σ = 2405472. Its totient is φ = 1804092.

The previous prime is 2104759. The next prime is 2104811. The reversal of 2104781 is 1874012.

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 2104781 - 2⁶ = 2104717 is a prime.

It is a super-3 number, since 3×2104781³ = 27973190233314634623, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104741) 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, 150335 + ... + 150348.

It is an arithmetic number, because the mean of its divisors is an integer number (601368).

2^2104781 is an apocalyptic number.

It is an amenable number.

2104781 is a deficient number, since it is larger than the sum of its proper divisors (300691).

2104781 is an equidigital number, since it uses as much as digits as its factorization.

2104781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300690.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 2104781 is about 1450.7863385075. The cubic root of 2104781 is about 128.1550245717.

Adding to 2104781 its reverse (1874012), we get a palindrome (3978793).

The spelling of 2104781 in words is "two million, one hundred four thousand, seven hundred eighty-one".