51315128873 has 4 divisors (see below), whose sum is σ = 52184876880. Its totient is φ = 50445380868.

The previous prime is 51315128833. The next prime is 51315128911. The reversal of 51315128873 is 37882151315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37882151315 = 5 ⋅7576430263.

It is a cyclic number.

It is not a de Polignac number, because 51315128873 - 2¹⁴ = 51315112489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51315128833) 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, 434873915 + ... + 434874032.

It is an arithmetic number, because the mean of its divisors is an integer number (13046219220).

Almost surely, 2^51315128873 is an apocalyptic number.

It is an amenable number.

51315128873 is a deficient number, since it is larger than the sum of its proper divisors (869748007).

51315128873 is an equidigital number, since it uses as much as digits as its factorization.

51315128873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869748006.

The product of its digits is 201600, while the sum is 44.

The spelling of 51315128873 in words is "fifty-one billion, three hundred fifteen million, one hundred twenty-eight thousand, eight hundred seventy-three".