51071191 has 2 divisors, whose sum is σ = 51071192. Its totient is φ = 51071190.

The previous prime is 51071149. The next prime is 51071197. The reversal of 51071191 is 19117015.

51071191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51071191 - 2¹⁵ = 51038423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51071197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25535595 + 25535596.

It is an arithmetic number, because the mean of its divisors is an integer number (25535596).

Almost surely, 2^51071191 is an apocalyptic number.

51071191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51071191 is an equidigital number, since it uses as much as digits as its factorization.

51071191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 315, while the sum is 25.

The square root of 51071191 is about 7146.4110573070. The cubic root of 51071191 is about 371.0154501791.

The spelling of 51071191 in words is "fifty-one million, seventy-one thousand, one hundred ninety-one".