51921908439 has 16 divisors (see below), whose sum is σ = 69610226400. Its totient is φ = 34424248320.

The previous prime is 51921908429. The next prime is 51921908477. The reversal of 51921908439 is 93480912915.

It is not a de Polignac number, because 51921908439 - 2⁵ = 51921908407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51921908391 and 51921908400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51921908429) 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 15 ways as a sum of consecutive naturals, for example, 1472487 + ... + 1507335.

It is an arithmetic number, because the mean of its divisors is an integer number (4350639150).

Almost surely, 2^51921908439 is an apocalyptic number.

51921908439 is a deficient number, since it is larger than the sum of its proper divisors (17688317961).

51921908439 is a wasteful number, since it uses less digits than its factorization.

51921908439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37570.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 51921908439 in words is "fifty-one billion, nine hundred twenty-one million, nine hundred eight thousand, four hundred thirty-nine".