51139521800 has 48 divisors (see below), whose sum is σ = 119835663360. Its totient is φ = 20294729280.

The previous prime is 51139521793. The next prime is 51139521803. The reversal of 51139521800 is 812593115.

It is not an unprimeable number, because it can be changed into a prime (51139521803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 981284 + ... + 1032083.

It is an arithmetic number, because the mean of its divisors is an integer number (2496576320).

Almost surely, 2^51139521800 is an apocalyptic number.

51139521800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51139521800 is an abundant number, since it is smaller than the sum of its proper divisors (68696141560).

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

51139521800 is a wasteful number, since it uses less digits than its factorization.

51139521800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013510 (or 2013501 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 51139521800 in words is "fifty-one billion, one hundred thirty-nine million, five hundred twenty-one thousand, eight hundred".