51539721244 has 24 divisors (see below), whose sum is σ = 98405854848. Its totient is φ = 23424326640.

The previous prime is 51539721241. The next prime is 51539721319. The reversal of 51539721244 is 44212793515.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51539721244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51539721241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324097 + ... + 456199.

It is an arithmetic number, because the mean of its divisors is an integer number (4100243952).

Almost surely, 2^51539721244 is an apocalyptic number.

It is an amenable number.

51539721244 is a deficient number, since it is larger than the sum of its proper divisors (46866133604).

51539721244 is a wasteful number, since it uses less digits than its factorization.

51539721244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140985 (or 140983 counting only the distinct ones).

The product of its digits is 302400, while the sum is 43.

The spelling of 51539721244 in words is "fifty-one billion, five hundred thirty-nine million, seven hundred twenty-one thousand, two hundred forty-four".