55609709 has 4 divisors (see below), whose sum is σ = 55625916. Its totient is φ = 55593504.

The previous prime is 55609681. The next prime is 55609711. The reversal of 55609709 is 90790655.

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 15642025 + 39967684 = 3955^2 + 6322^2 .

It is a cyclic number.

It is not a de Polignac number, because 55609709 - 2¹⁶ = 55544173 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 (55609739) 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, 704 + ... + 10569.

It is an arithmetic number, because the mean of its divisors is an integer number (13906479).

Almost surely, 2^55609709 is an apocalyptic number.

It is an amenable number.

55609709 is a deficient number, since it is larger than the sum of its proper divisors (16207).

55609709 is a wasteful number, since it uses less digits than its factorization.

55609709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 55609709 is about 7457.1917636601. The cubic root of 55609709 is about 381.6953543607.

The spelling of 55609709 in words is "fifty-five million, six hundred nine thousand, seven hundred nine".