55642289 has 4 divisors (see below), whose sum is σ = 56999460. Its totient is φ = 54285120.

The previous prime is 55642283. The next prime is 55642297. The reversal of 55642289 is 98224655.

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 26697889 + 28944400 = 5167^2 + 5380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55642289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1357129 = 55642289 / (5 + 5 + 6 + 4 + 2 + 2 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55642283) 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, 678524 + ... + 678605.

It is an arithmetic number, because the mean of its divisors is an integer number (14249865).

Almost surely, 2^55642289 is an apocalyptic number.

It is an amenable number.

55642289 is a deficient number, since it is larger than the sum of its proper divisors (1357171).

55642289 is a wasteful number, since it uses less digits than its factorization.

55642289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357170.

The product of its digits is 172800, while the sum is 41.

The square root of 55642289 is about 7459.3759122329. The cubic root of 55642289 is about 381.7698809563.

The spelling of 55642289 in words is "fifty-five million, six hundred forty-two thousand, two hundred eighty-nine".