2041781 has 6 divisors (see below), whose sum is σ = 2375190. Its totient is φ = 1750056.

The previous prime is 2041757. The next prime is 2041783. The reversal of 2041781 is 1871402.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 625681 = 1190^2 + 791^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2041781 is a prime.

It is a super-2 number, since 2×2041781² = 8337739303922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2041783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20786 + ... + 20883.

It is an arithmetic number, because the mean of its divisors is an integer number (395865).

2^2041781 is an apocalyptic number.

It is an amenable number.

2041781 is a deficient number, since it is larger than the sum of its proper divisors (333409).

2041781 is an equidigital number, since it uses as much as digits as its factorization.

2041781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41683 (or 41676 counting only the distinct ones).

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

The square root of 2041781 is about 1428.9090243959. The cubic root of 2041781 is about 126.8634115456.

The spelling of 2041781 in words is "two million, forty-one thousand, seven hundred eighty-one".