51820159 has 2 divisors, whose sum is σ = 51820160. Its totient is φ = 51820158.

The previous prime is 51820157. The next prime is 51820169. The reversal of 51820159 is 95102815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51820159 - 2¹ = 51820157 is a prime.

Together with 51820157, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51820159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51820157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25910079 + 25910080.

It is an arithmetic number, because the mean of its divisors is an integer number (25910080).

Almost surely, 2^51820159 is an apocalyptic number.

51820159 is a deficient number, since it is larger than the sum of its proper divisors (1).

51820159 is an equidigital number, since it uses as much as digits as its factorization.

51820159 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 31.

The square root of 51820159 is about 7198.6220209148. The cubic root of 51820159 is about 372.8203247368.

The spelling of 51820159 in words is "fifty-one million, eight hundred twenty thousand, one hundred fifty-nine".