51025840321 has 3 divisors (see below), whose sum is σ = 51026066211. Its totient is φ = 51025614432.

The previous prime is 51025840253. The next prime is 51025840351. The reversal of 51025840321 is 12304852015.

The square root of 51025840321 is 225889.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3064840321 + 47961000000 = 55361^2 + 219000^2 .

It is not a de Polignac number, because 51025840321 - 2¹⁷ = 51025709249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51025840351) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 112945 + ... + 338833.

It is an arithmetic number, because the mean of its divisors is an integer number (17008688737).

Almost surely, 2^51025840321 is an apocalyptic number.

51025840321 is the 225889-th square number.

51025840321 is the 112945-th centered octagonal number.

It is an amenable number.

51025840321 is a deficient number, since it is larger than the sum of its proper divisors (225890).

51025840321 is an frugal number, since it uses more digits than its factorization.

51025840321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451778 (or 225889 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 51025840321 in words is "fifty-one billion, twenty-five million, eight hundred forty thousand, three hundred twenty-one".