51839371349 has 4 divisors (see below), whose sum is σ = 52102515564. Its totient is φ = 51576227136.

The previous prime is 51839371327. The next prime is 51839371357. The reversal of 51839371349 is 94317393815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94317393815 = 5 ⋅18863478763.

It can be written as a sum of positive squares in 2 ways, for example, as 32912490724 + 18926880625 = 181418^2 + 137575^2 .

It is a cyclic number.

It is not a de Polignac number, because 51839371349 - 2⁸ = 51839371093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51839371349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51839371369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131571812 + ... + 131572205.

It is an arithmetic number, because the mean of its divisors is an integer number (13025628891).

Almost surely, 2^51839371349 is an apocalyptic number.

It is an amenable number.

51839371349 is a deficient number, since it is larger than the sum of its proper divisors (263144215).

51839371349 is a wasteful number, since it uses less digits than its factorization.

51839371349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263144214.

The product of its digits is 2449440, while the sum is 53.

The spelling of 51839371349 in words is "fifty-one billion, eight hundred thirty-nine million, three hundred seventy-one thousand, three hundred forty-nine".