51000043100 has 72 divisors (see below), whose sum is σ = 113719888128. Its totient is φ = 19843185600.

The previous prime is 51000043099. The next prime is 51000043109. The reversal of 51000043100 is 134000015.

It is a super-2 number, since 2×51000043100² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000043109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 732815 + ... + 799385.

Almost surely, 2^51000043100 is an apocalyptic number.

51000043100 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 51000043100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56859944064).

51000043100 is an abundant number, since it is smaller than the sum of its proper divisors (62719845028).

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

51000043100 is a wasteful number, since it uses less digits than its factorization.

51000043100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66795 (or 66788 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

Adding to 51000043100 its reverse (134000015), we get a palindrome (51134043115).

The spelling of 51000043100 in words is "fifty-one billion, forty-three thousand, one hundred".