51871849 has 2 divisors, whose sum is σ = 51871850. Its totient is φ = 51871848.

The previous prime is 51871837. The next prime is 51871871. The reversal of 51871849 is 94817815.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44796249 + 7075600 = 6693^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 51871849 - 2¹¹ = 51869801 is a prime.

It is not a weakly prime, because it can be changed into another prime (51875849) 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, 25935924 + 25935925.

It is an arithmetic number, because the mean of its divisors is an integer number (25935925).

Almost surely, 2^51871849 is an apocalyptic number.

It is an amenable number.

51871849 is a deficient number, since it is larger than the sum of its proper divisors (1).

51871849 is an equidigital number, since it uses as much as digits as its factorization.

51871849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 51871849 is about 7202.2113965087. The cubic root of 51871849 is about 372.9442448414.

The spelling of 51871849 in words is "fifty-one million, eight hundred seventy-one thousand, eight hundred forty-nine".