51431440244 has 6 divisors (see below), whose sum is σ = 90005020434. Its totient is φ = 25715720120.

The previous prime is 51431440237. The next prime is 51431440267. The reversal of 51431440244 is 44204413415.

It can be written as a sum of positive squares in only one way, i.e., 48207471844 + 3223968400 = 219562^2 + 56780^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51431440244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428930027 + ... + 6428930034.

It is an arithmetic number, because the mean of its divisors is an integer number (15000836739).

Almost surely, 2^51431440244 is an apocalyptic number.

It is an amenable number.

51431440244 is a deficient number, since it is larger than the sum of its proper divisors (38573580190).

51431440244 is a wasteful number, since it uses less digits than its factorization.

51431440244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12857860065 (or 12857860063 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 51431440244 its reverse (44204413415), we get a palindrome (95635853659).

The spelling of 51431440244 in words is "fifty-one billion, four hundred thirty-one million, four hundred forty thousand, two hundred forty-four".