4543661 has 4 divisors (see below), whose sum is σ = 4654524. Its totient is φ = 4432800.

The previous prime is 4543657. The next prime is 4543667. The reversal of 4543661 is 1663454.

It is a happy number.

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 175561 + 4368100 = 419^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 4543661 - 2² = 4543657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4543667) 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, 55370 + ... + 55451.

It is an arithmetic number, because the mean of its divisors is an integer number (1163631).

Almost surely, 2^4543661 is an apocalyptic number.

4543661 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4543661 is a deficient number, since it is larger than the sum of its proper divisors (110863).

4543661 is a wasteful number, since it uses less digits than its factorization.

4543661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110862.

The product of its digits is 8640, while the sum is 29.

The square root of 4543661 is about 2131.5864983622. The cubic root of 4543661 is about 165.6285909272.

The spelling of 4543661 in words is "four million, five hundred forty-three thousand, six hundred sixty-one".