51051800 has 24 divisors (see below), whose sum is σ = 118695900. Its totient is φ = 20420640.

The previous prime is 51051797. The next prime is 51051809. The reversal of 51051800 is 815015.

51051800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127430 + ... + 127829.

Almost surely, 2^51051800 is an apocalyptic number.

51051800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51051800 is an abundant number, since it is smaller than the sum of its proper divisors (67644100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51051800 is a wasteful number, since it uses less digits than its factorization.

51051800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255275 (or 255266 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 51051800 is about 7145.0542335241. The cubic root of 51051800 is about 370.9684878169.

Adding to 51051800 its reverse (815015), we get a palindrome (51866815).

The spelling of 51051800 in words is "fifty-one million, fifty-one thousand, eight hundred".