51839154281 has 4 divisors (see below), whose sum is σ = 51840545364. Its totient is φ = 51837763200.

The previous prime is 51839154193. The next prime is 51839154293. The reversal of 51839154281 is 18245193815.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29056270681 + 22782883600 = 170459^2 + 150940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51839154281 is a prime.

It is a super-2 number, since 2×51839154281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51839154181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638060 + ... + 714701.

It is an arithmetic number, because the mean of its divisors is an integer number (12960136341).

Almost surely, 2^51839154281 is an apocalyptic number.

It is an amenable number.

51839154281 is a deficient number, since it is larger than the sum of its proper divisors (1391083).

51839154281 is a wasteful number, since it uses less digits than its factorization.

51839154281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391082.

The product of its digits is 345600, while the sum is 47.

The spelling of 51839154281 in words is "fifty-one billion, eight hundred thirty-nine million, one hundred fifty-four thousand, two hundred eighty-one".