3549781 has 4 divisors (see below), whose sum is σ = 3616812. Its totient is φ = 3482752.

The previous prime is 3549757. The next prime is 3549811. The reversal of 3549781 is 1879453.

3549781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1069156 + 2480625 = 1034^2 + 1575^2 .

It is a cyclic number.

It is not a de Polignac number, because 3549781 - 2¹³ = 3541589 is a prime.

It is a super-2 number, since 2×3549781² = 25201890295922, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 3549781 parts by 2664 straight cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3549781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3549701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33436 + ... + 33541.

It is an arithmetic number, because the mean of its divisors is an integer number (904203).

Almost surely, 2^3549781 is an apocalyptic number.

It is an amenable number.

3549781 is a deficient number, since it is larger than the sum of its proper divisors (67031).

3549781 is an equidigital number, since it uses as much as digits as its factorization.

3549781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67030.

The product of its digits is 30240, while the sum is 37.

The square root of 3549781 is about 1884.0862506796. The cubic root of 3549781 is about 152.5458932018.

The spelling of 3549781 in words is "three million, five hundred forty-nine thousand, seven hundred eighty-one".