51388559 has 4 divisors (see below), whose sum is σ = 54093240. Its totient is φ = 48683880.

The previous prime is 51388543. The next prime is 51388591. The reversal of 51388559 is 95588315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51388559 - 2⁴ = 51388543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51388529) 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, 1352312 + ... + 1352349.

It is an arithmetic number, because the mean of its divisors is an integer number (13523310).

Almost surely, 2^51388559 is an apocalyptic number.

51388559 is a deficient number, since it is larger than the sum of its proper divisors (2704681).

51388559 is a wasteful number, since it uses less digits than its factorization.

51388559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704680.

The product of its digits is 216000, while the sum is 44.

The square root of 51388559 is about 7168.5813798826. The cubic root of 51388559 is about 371.7823885285.

The spelling of 51388559 in words is "fifty-one million, three hundred eighty-eight thousand, five hundred fifty-nine".