51319161 has 6 divisors (see below), whose sum is σ = 74127690. Its totient is φ = 34212768.

The previous prime is 51319157. The next prime is 51319189. The reversal of 51319161 is 16191315.

51319161 is a `hidden beast` number, since 513 + 1 + 91 + 61 = 666.

51319161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 553536 = 7125^2 + 744^2 .

It is not a de Polignac number, because 51319161 - 2² = 51319157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51309161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2851056 + ... + 2851073.

It is an arithmetic number, because the mean of its divisors is an integer number (12354615).

Almost surely, 2^51319161 is an apocalyptic number.

It is an amenable number.

51319161 is a deficient number, since it is larger than the sum of its proper divisors (22808529).

51319161 is a wasteful number, since it uses less digits than its factorization.

51319161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5702135 (or 5702132 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 51319161 is about 7163.7393168652. The cubic root of 51319161 is about 371.6149545200.

The spelling of 51319161 in words is "fifty-one million, three hundred nineteen thousand, one hundred sixty-one".