55617889 has 4 divisors (see below), whose sum is σ = 55750420. Its totient is φ = 55485360.

The previous prime is 55617833. The next prime is 55617923. The reversal of 55617889 is 98871655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98871655 = 5 ⋅19774331.

It can be written as a sum of positive squares in 2 ways, for example, as 17918289 + 37699600 = 4233^2 + 6140^2 .

It is a cyclic number.

It is not a de Polignac number, because 55617889 - 2¹¹ = 55615841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55611889) 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, 65634 + ... + 66475.

It is an arithmetic number, because the mean of its divisors is an integer number (13937605).

Almost surely, 2^55617889 is an apocalyptic number.

It is an amenable number.

55617889 is a deficient number, since it is larger than the sum of its proper divisors (132531).

55617889 is a wasteful number, since it uses less digits than its factorization.

55617889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132530.

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

The square root of 55617889 is about 7457.7402073282. The cubic root of 55617889 is about 381.7140688081.

The spelling of 55617889 in words is "fifty-five million, six hundred seventeen thousand, eight hundred eighty-nine".