55917289 has 4 divisors (see below), whose sum is σ = 56135124. Its totient is φ = 55699456.

The previous prime is 55917283. The next prime is 55917293. The reversal of 55917289 is 98271955.

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 41538025 + 14379264 = 6445^2 + 3792^2 .

It is a cyclic number.

It is not a de Polignac number, because 55917289 - 2¹⁷ = 55786217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55917283) 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, 108532 + ... + 109045.

It is an arithmetic number, because the mean of its divisors is an integer number (14033781).

Almost surely, 2^55917289 is an apocalyptic number.

It is an amenable number.

55917289 is a deficient number, since it is larger than the sum of its proper divisors (217835).

55917289 is a wasteful number, since it uses less digits than its factorization.

55917289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217834.

The product of its digits is 226800, while the sum is 46.

The square root of 55917289 is about 7477.7863703104. The cubic root of 55917289 is about 382.3977860648.

It can be divided in two parts, 5591 and 7289, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 55917289 in words is "fifty-five million, nine hundred seventeen thousand, two hundred eighty-nine".