51209044250 has 128 divisors (see below), whose sum is σ = 119483320320. Its totient is φ = 16001107200.

The previous prime is 51209044241. The next prime is 51209044297. The reversal of 51209044250 is 5244090215.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1783004 + ... + 1811496.

It is an arithmetic number, because the mean of its divisors is an integer number (933463440).

Almost surely, 2^51209044250 is an apocalyptic number.

51209044250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51209044250 is an abundant number, since it is smaller than the sum of its proper divisors (68274276070).

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

51209044250 is a wasteful number, since it uses less digits than its factorization.

51209044250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28609 (or 28599 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 51209044250 in words is "fifty-one billion, two hundred nine million, forty-four thousand, two hundred fifty".