51248357161 has 3 divisors (see below), whose sum is σ = 51248583543. Its totient is φ = 51248130780.

The previous prime is 51248357077. The next prime is 51248357219. The reversal of 51248357161 is 16175384215.

The square root of 51248357161 is 226381.

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., 22599409561 + 28648947600 = 150331^2 + 169260^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51248357161 is a prime.

It is a super-2 number, since 2×51248357161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51248352161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 113191 + ... + 339571.

It is an arithmetic number, because the mean of its divisors is an integer number (17082861181).

Almost surely, 2^51248357161 is an apocalyptic number.

51248357161 is the 226381-st square number.

51248357161 is the 113191-st centered octagonal number.

It is an amenable number.

51248357161 is a deficient number, since it is larger than the sum of its proper divisors (226382).

51248357161 is an frugal number, since it uses more digits than its factorization.

51248357161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452762 (or 226381 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The spelling of 51248357161 in words is "fifty-one billion, two hundred forty-eight million, three hundred fifty-seven thousand, one hundred sixty-one".