51513445201 has 4 divisors (see below), whose sum is σ = 51645870900. Its totient is φ = 51381019504.

The previous prime is 51513445199. The next prime is 51513445303. The reversal of 51513445201 is 10254431515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10254431515 = 5 ⋅2050886303.

It can be written as a sum of positive squares in 2 ways, for example, as 24704294976 + 26809150225 = 157176^2 + 163735^2 .

It is a cyclic number.

It is not a de Polignac number, because 51513445201 - 2¹ = 51513445199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51513445001) 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, 66212266 + ... + 66213043.

It is an arithmetic number, because the mean of its divisors is an integer number (12911467725).

Almost surely, 2^51513445201 is an apocalyptic number.

It is an amenable number.

51513445201 is a deficient number, since it is larger than the sum of its proper divisors (132425699).

51513445201 is a wasteful number, since it uses less digits than its factorization.

51513445201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132425698.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 51513445201 its reverse (10254431515), we get a palindrome (61767876716).

The spelling of 51513445201 in words is "fifty-one billion, five hundred thirteen million, four hundred forty-five thousand, two hundred one".