4081549 has 2 divisors, whose sum is σ = 4081550. Its totient is φ = 4081548.

The previous prime is 4081543. The next prime is 4081579. The reversal of 4081549 is 9451804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2856100 + 1225449 = 1690^2 + 1107^2 .

It is a cyclic number.

It is not a de Polignac number, because 4081549 - 2³ = 4081541 is a prime.

It is a Chen prime.

It is equal to p₂₈₈₅₆₂ and since 4081549 and 288562 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4081549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4081541) 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, 2040774 + 2040775.

It is an arithmetic number, because the mean of its divisors is an integer number (2040775).

Almost surely, 2^4081549 is an apocalyptic number.

It is an amenable number.

4081549 is a deficient number, since it is larger than the sum of its proper divisors (1).

4081549 is an equidigital number, since it uses as much as digits as its factorization.

4081549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 4081549 is about 2020.2843859219. The cubic root of 4081549 is about 159.8116142170.

The spelling of 4081549 in words is "four million, eighty-one thousand, five hundred forty-nine".