51351161 has 4 divisors (see below), whose sum is σ = 51396852. Its totient is φ = 51305472.

The previous prime is 51351149. The next prime is 51351197. The reversal of 51351161 is 16115315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16115315 = 5 ⋅3223063.

It can be written as a sum of positive squares in 2 ways, for example, as 48038761 + 3312400 = 6931^2 + 1820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51351161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51351361) 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, 21116 + ... + 23421.

It is an arithmetic number, because the mean of its divisors is an integer number (12849213).

Almost surely, 2^51351161 is an apocalyptic number.

It is an amenable number.

51351161 is a deficient number, since it is larger than the sum of its proper divisors (45691).

51351161 is a wasteful number, since it uses less digits than its factorization.

51351161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45690.

The product of its digits is 450, while the sum is 23.

The square root of 51351161 is about 7165.9724392437. The cubic root of 51351161 is about 371.6921784879.

Adding to 51351161 its reverse (16115315), we get a palindrome (67466476).

The spelling of 51351161 in words is "fifty-one million, three hundred fifty-one thousand, one hundred sixty-one".