51301300500 has 144 divisors (see below), whose sum is σ = 165602813376. Its totient is φ = 13362148800.

The previous prime is 51301300499. The next prime is 51301300513. The reversal of 51301300500 is 500310315.

It is a happy number.

51301300500 is a `hidden beast` number, since 5 + 1 + 30 + 130 + 0 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60939 + ... + 326061.

Almost surely, 2^51301300500 is an apocalyptic number.

51301300500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51301300500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82801406688).

51301300500 is an abundant number, since it is smaller than the sum of its proper divisors (114301512876).

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

51301300500 is a wasteful number, since it uses less digits than its factorization.

51301300500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265191 (or 265176 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

Adding to 51301300500 its reverse (500310315), we get a palindrome (51801610815).

The spelling of 51301300500 in words is "fifty-one billion, three hundred one million, three hundred thousand, five hundred".