51995717 has 2 divisors, whose sum is σ = 51995718. Its totient is φ = 51995716.

The previous prime is 51995701. The next prime is 51995719. The reversal of 51995717 is 71759915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49126081 + 2869636 = 7009^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 51995717 - 2⁴ = 51995701 is a prime.

Together with 51995719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51995719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25997858 + 25997859.

It is an arithmetic number, because the mean of its divisors is an integer number (25997859).

Almost surely, 2^51995717 is an apocalyptic number.

It is an amenable number.

51995717 is a deficient number, since it is larger than the sum of its proper divisors (1).

51995717 is an equidigital number, since it uses as much as digits as its factorization.

51995717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99225, while the sum is 44.

The square root of 51995717 is about 7210.8055721951. The cubic root of 51995717 is about 373.2408677431.

The spelling of 51995717 in words is "fifty-one million, nine hundred ninety-five thousand, seven hundred seventeen".