5661309 has 4 divisors (see below), whose sum is σ = 7548416. Its totient is φ = 3774204.

The previous prime is 5661287. The next prime is 5661311. The reversal of 5661309 is 9031665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5661309 - 2⁵ = 5661277 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943549 + ... + 943554.

It is an arithmetic number, because the mean of its divisors is an integer number (1887104).

Almost surely, 2^5661309 is an apocalyptic number.

It is an amenable number.

5661309 is a deficient number, since it is larger than the sum of its proper divisors (1887107).

5661309 is a wasteful number, since it uses less digits than its factorization.

5661309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887106.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 5661309 is about 2379.3505416395. The cubic root of 5661309 is about 178.2265033053.

The spelling of 5661309 in words is "five million, six hundred sixty-one thousand, three hundred nine".