51481271812 has 6 divisors (see below), whose sum is σ = 90092225678. Its totient is φ = 25740635904.

The previous prime is 51481271731. The next prime is 51481271827. The reversal of 51481271812 is 21817218415.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 42277939456 + 9203332356 = 205616^2 + 95934^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6435158973 + ... + 6435158980.

Almost surely, 2^51481271812 is an apocalyptic number.

It is an amenable number.

51481271812 is a deficient number, since it is larger than the sum of its proper divisors (38610953866).

51481271812 is a wasteful number, since it uses less digits than its factorization.

51481271812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870317957 (or 12870317955 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The spelling of 51481271812 in words is "fifty-one billion, four hundred eighty-one million, two hundred seventy-one thousand, eight hundred twelve".