51002500 has 60 divisors (see below), whose sum is σ = 116512704. Its totient is φ = 19492000.

The previous prime is 51002467. The next prime is 51002507. The reversal of 51002500 is 520015.

It is not an unprimeable number, because it can be changed into a prime (51002507) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57057 + ... + 57943.

Almost surely, 2^51002500 is an apocalyptic number.

51002500 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 51002500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58256352).

51002500 is an abundant number, since it is smaller than the sum of its proper divisors (65510204).

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

51002500 is a wasteful number, since it uses less digits than its factorization.

51002500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 51002500 is about 7141.6034614084. The cubic root of 51002500 is about 370.8490363534.

Adding to 51002500 its reverse (520015), we get a palindrome (51522515).

The spelling of 51002500 in words is "fifty-one million, two thousand, five hundred".