51385354281 has 6 divisors (see below), whose sum is σ = 74223289530. Its totient is φ = 34256902848.

The previous prime is 51385354271. The next prime is 51385354291. The reversal of 51385354281 is 18245358315.

51385354281 is a `hidden beast` number, since 5 + 1 + 38 + 535 + 4 + 2 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (51385354271) and next prime (51385354291).

It can be written as a sum of positive squares in only one way, i.e., 31969440000 + 19415914281 = 178800^2 + 139341^2 .

It is not a de Polignac number, because 51385354281 - 2⁶ = 51385354217 is a prime.

It is a super-2 number, since 2×51385354281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51385354211) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 2854741896 + ... + 2854741913.

It is an arithmetic number, because the mean of its divisors is an integer number (12370548255).

Almost surely, 2^51385354281 is an apocalyptic number.

It is an amenable number.

51385354281 is a deficient number, since it is larger than the sum of its proper divisors (22837935249).

51385354281 is a wasteful number, since it uses less digits than its factorization.

51385354281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709483815 (or 5709483812 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The spelling of 51385354281 in words is "fifty-one billion, three hundred eighty-five million, three hundred fifty-four thousand, two hundred eighty-one".