51806351 has 2 divisors, whose sum is σ = 51806352. Its totient is φ = 51806350.

The previous prime is 51806347. The next prime is 51806353. The reversal of 51806351 is 15360815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51806351 - 2² = 51806347 is a prime.

Together with 51806353, 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 (51806353) 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, 25903175 + 25903176.

It is an arithmetic number, because the mean of its divisors is an integer number (25903176).

Almost surely, 2^51806351 is an apocalyptic number.

51806351 is a deficient number, since it is larger than the sum of its proper divisors (1).

51806351 is an equidigital number, since it uses as much as digits as its factorization.

51806351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 51806351 is about 7197.6628845758. The cubic root of 51806351 is about 372.7872078929.

The spelling of 51806351 in words is "fifty-one million, eight hundred six thousand, three hundred fifty-one".