55256609 has 4 divisors (see below), whose sum is σ = 55277616. Its totient is φ = 55235604.

The previous prime is 55256573. The next prime is 55256611. The reversal of 55256609 is 90665255.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90665255 = 5 ⋅18133051.

It is a cyclic number.

It is not a de Polignac number, because 55256609 - 2²⁴ = 38479393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55256639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5879 + ... + 12044.

It is an arithmetic number, because the mean of its divisors is an integer number (13819404).

Almost surely, 2^55256609 is an apocalyptic number.

It is an amenable number.

55256609 is a deficient number, since it is larger than the sum of its proper divisors (21007).

55256609 is a wasteful number, since it uses less digits than its factorization.

55256609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21006.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 55256609 is about 7433.4789298148. The cubic root of 55256609 is about 380.8857661173.

The spelling of 55256609 in words is "fifty-five million, two hundred fifty-six thousand, six hundred nine".