5661909 has 12 divisors (see below), whose sum is σ = 8921952. Its totient is φ = 3431400.

The previous prime is 5661907. The next prime is 5661911. The reversal of 5661909 is 9091665.

5661909 is a `hidden beast` number, since 566 + 1 + 90 + 9 = 666.

5661909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (5661907) and next prime (5661911).

It is not a de Polignac number, because 5661909 - 2¹ = 5661907 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28497 + ... + 28694.

It is an arithmetic number, because the mean of its divisors is an integer number (743496).

Almost surely, 2^5661909 is an apocalyptic number.

It is an amenable number.

5661909 is a deficient number, since it is larger than the sum of its proper divisors (3260043).

5661909 is a wasteful number, since it uses less digits than its factorization.

5661909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57208 (or 57205 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 5661909 is about 2379.4766231253. The cubic root of 5661909 is about 178.2327993831.

The spelling of 5661909 in words is "five million, six hundred sixty-one thousand, nine hundred nine".