55871689 has 4 divisors (see below), whose sum is σ = 55893124. Its totient is φ = 55850256.

The previous prime is 55871653. The next prime is 55871701. The reversal of 55871689 is 98617855.

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 49070025 + 6801664 = 7005^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 55871689 - 2¹¹ = 55869641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55871789) 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, 6162 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (13973281).

Almost surely, 2^55871689 is an apocalyptic number.

It is an amenable number.

55871689 is a deficient number, since it is larger than the sum of its proper divisors (21435).

55871689 is a wasteful number, since it uses less digits than its factorization.

55871689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21434.

The product of its digits is 604800, while the sum is 49.

The square root of 55871689 is about 7474.7367177714. The cubic root of 55871689 is about 382.2938105831.

The spelling of 55871689 in words is "fifty-five million, eight hundred seventy-one thousand, six hundred eighty-nine".