51712081 has 2 divisors, whose sum is σ = 51712082. Its totient is φ = 51712080.

The previous prime is 51712049. The next prime is 51712097. The reversal of 51712081 is 18021715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51710481 + 1600 = 7191^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 51712081 - 2⁵ = 51712049 is a prime.

It is a super-2 number, since 2×51712081² = 5348278642701122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51712021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25856040 + 25856041.

It is an arithmetic number, because the mean of its divisors is an integer number (25856041).

Almost surely, 2^51712081 is an apocalyptic number.

It is an amenable number.

51712081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51712081 is an equidigital number, since it uses as much as digits as its factorization.

51712081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 51712081 is about 7191.1112493133. Note that the first 3 decimals coincide. The cubic root of 51712081 is about 372.5609551466.

Adding to 51712081 its reverse (18021715), we get a palindrome (69733796).

The spelling of 51712081 in words is "fifty-one million, seven hundred twelve thousand, eighty-one".