2661549 has 16 divisors (see below), whose sum is σ = 3939840. Its totient is φ = 1584560.

The previous prime is 2661541. The next prime is 2661553. The reversal of 2661549 is 9451662.

2661549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2661549 - 2³ = 2661541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

Its product of digits (12960) is a multiple of the sum of its prime divisors (1440).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661541) 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 15 ways as a sum of consecutive naturals, for example, 1264 + ... + 2630.

It is an arithmetic number, because the mean of its divisors is an integer number (246240).

2^2661549 is an apocalyptic number.

It is an amenable number.

2661549 is a deficient number, since it is larger than the sum of its proper divisors (1278291).

2661549 is a wasteful number, since it uses less digits than its factorization.

2661549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its digits is 12960, while the sum is 33.

The square root of 2661549 is about 1631.4254503348. The cubic root of 2661549 is about 138.5834882641.

The spelling of 2661549 in words is "two million, six hundred sixty-one thousand, five hundred forty-nine".