541781 has 2 divisors, whose sum is σ = 541782. Its totient is φ = 541780.

The previous prime is 541777. The next prime is 541799. The reversal of 541781 is 187145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 3025 = 734^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 541781 - 2² = 541777 is a prime.

It is a super-2 number, since 2×541781² = 587053303922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 541781.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 541781.

It is not a weakly prime, because it can be changed into another prime (541711) 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 as a sum of consecutive naturals, namely, 270890 + 270891.

It is an arithmetic number, because the mean of its divisors is an integer number (270891).

2⁵⁴¹⁷⁸¹ is an apocalyptic number.

It is an amenable number.

541781 is a deficient number, since it is larger than the sum of its proper divisors (1).

541781 is an equidigital number, since it uses as much as digits as its factorization.

541781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 26.

The square root of 541781 is about 736.0577423002. The cubic root of 541781 is about 81.5219557693.

The spelling of 541781 in words is "five hundred forty-one thousand, seven hundred eighty-one".