51800055 has 8 divisors (see below), whose sum is σ = 82880112. Its totient is φ = 27626688.

The previous prime is 51800011. The next prime is 51800057. The reversal of 51800055 is 55000815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51800055 - 2¹¹ = 51798007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51799998 and 51800034.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51800057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1726654 + ... + 1726683.

It is an arithmetic number, because the mean of its divisors is an integer number (10360014).

Almost surely, 2^51800055 is an apocalyptic number.

51800055 is a deficient number, since it is larger than the sum of its proper divisors (31080057).

51800055 is a wasteful number, since it uses less digits than its factorization.

51800055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453345.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 51800055 is about 7197.2255070965. The cubic root of 51800055 is about 372.7721057332.

The spelling of 51800055 in words is "fifty-one million, eight hundred thousand, fifty-five".