3549661 has 4 divisors (see below), whose sum is σ = 3592512. Its totient is φ = 3506812.

The previous prime is 3549649. The next prime is 3549673. The reversal of 3549661 is 1669453.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3549649) and next prime (3549673).

It is a cyclic number.

It is not a de Polignac number, because 3549661 - 2¹¹ = 3547613 is a prime.

It is a Duffinian number.

3549661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3549631) 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 in 3 ways as a sum of consecutive naturals, for example, 21301 + ... + 21466.

It is an arithmetic number, because the mean of its divisors is an integer number (898128).

Almost surely, 2^3549661 is an apocalyptic number.

It is an amenable number.

3549661 is a deficient number, since it is larger than the sum of its proper divisors (42851).

3549661 is an equidigital number, since it uses as much as digits as its factorization.

3549661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42850.

The product of its digits is 19440, while the sum is 34.

The square root of 3549661 is about 1884.0544047346. The cubic root of 3549661 is about 152.5441742494.

The spelling of 3549661 in words is "three million, five hundred forty-nine thousand, six hundred sixty-one".