5601661 has 4 divisors (see below), whose sum is σ = 6032572. Its totient is φ = 5170752.

The previous prime is 5601643. The next prime is 5601667. The reversal of 5601661 is 1661065.

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 1625625 + 3976036 = 1275^2 + 1994^2 .

It is a cyclic number.

It is not a de Polignac number, because 5601661 - 2⁹ = 5601149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5601667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215436 + ... + 215461.

It is an arithmetic number, because the mean of its divisors is an integer number (1508143).

Almost surely, 2^5601661 is an apocalyptic number.

It is an amenable number.

5601661 is a deficient number, since it is larger than the sum of its proper divisors (430911).

5601661 is a wasteful number, since it uses less digits than its factorization.

5601661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430910.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 5601661 is about 2366.7828375244. The cubic root of 5601661 is about 177.5983558575.

The spelling of 5601661 in words is "five million, six hundred one thousand, six hundred sixty-one".