4041781 has 2 divisors, whose sum is σ = 4041782. Its totient is φ = 4041780.

The previous prime is 4041773. The next prime is 4041787. The reversal of 4041781 is 1871404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4040100 + 1681 = 2010^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 4041781 - 2³ = 4041773 is a prime.

It is a super-2 number, since 2×4041781² = 32671987303922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4041787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020890 + 2020891.

It is an arithmetic number, because the mean of its divisors is an integer number (2020891).

Almost surely, 2^4041781 is an apocalyptic number.

4041781 is the 1272-nd centered pentagonal number.

It is an amenable number.

4041781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4041781 is an equidigital number, since it uses as much as digits as its factorization.

4041781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 4041781 is about 2010.4181157162. The cubic root of 4041781 is about 159.2908853076.

The spelling of 4041781 in words is "four million, forty-one thousand, seven hundred eighty-one".