55443609 has 24 divisors (see below), whose sum is σ = 89444992. Its totient is φ = 34117200.

The previous prime is 55443607. The next prime is 55443623. The reversal of 55443609 is 90634455.

It is a happy number.

55443609 is a `hidden beast` number, since 5 + 5 + 4 + 43 + 609 = 666.

It is not a de Polignac number, because 55443609 - 2¹ = 55443607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55443607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5617 + ... + 11934.

Almost surely, 2^55443609 is an apocalyptic number.

It is an amenable number.

55443609 is a deficient number, since it is larger than the sum of its proper divisors (34001383).

55443609 is a wasteful number, since it uses less digits than its factorization.

55443609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17579 (or 17567 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 55443609 is about 7446.0465349070. The cubic root of 55443609 is about 381.3149482112.

The spelling of 55443609 in words is "fifty-five million, four hundred forty-three thousand, six hundred nine".