5661009 has 20 divisors (see below), whose sum is σ = 8642304. Its totient is φ = 3691224.

The previous prime is 5661001. The next prime is 5661041. The reversal of 5661009 is 9001665.

It is not a de Polignac number, because 5661009 - 2³ = 5661001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3064 + ... + 4550.

Almost surely, 2^5661009 is an apocalyptic number.

It is an amenable number.

5661009 is a deficient number, since it is larger than the sum of its proper divisors (2981295).

5661009 is a wasteful number, since it uses less digits than its factorization.

5661009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 5661009 is about 2379.2874983911. The cubic root of 5661009 is about 178.2233550997.

The spelling of 5661009 in words is "five million, six hundred sixty-one thousand, nine".