51231287217044 has 48 divisors (see below), whose sum is σ = 99156045278976. Its totient is φ = 22965386457600.

The previous prime is 51231287217023. The next prime is 51231287217067. The reversal of 51231287217044 is 44071278213215.

It is a super-3 number, since 3×51231287217044³ (a number of 42 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51231287217044.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28045064 + ... + 29815904.

It is an arithmetic number, because the mean of its divisors is an integer number (2065750943312).

Almost surely, 2^{51231287217044} is an apocalyptic number.

It is an amenable number.

51231287217044 is a deficient number, since it is larger than the sum of its proper divisors (47924758061932).

51231287217044 is a wasteful number, since it uses less digits than its factorization.

51231287217044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779936 (or 1779934 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 51231287217044 in words is "fifty-one trillion, two hundred thirty-one billion, two hundred eighty-seven million, two hundred seventeen thousand, forty-four".