51385171 has 2 divisors, whose sum is σ = 51385172. Its totient is φ = 51385170.

The previous prime is 51385157. The next prime is 51385189. The reversal of 51385171 is 17158315.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51385171 is a prime.

It is not a weakly prime, because it can be changed into another prime (51385571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25692585 + 25692586.

It is an arithmetic number, because the mean of its divisors is an integer number (25692586).

Almost surely, 2^51385171 is an apocalyptic number.

51385171 is a deficient number, since it is larger than the sum of its proper divisors (1).

51385171 is an equidigital number, since it uses as much as digits as its factorization.

51385171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 31.

The square root of 51385171 is about 7168.3450670291. The cubic root of 51385171 is about 371.7742179264.

The spelling of 51385171 in words is "fifty-one million, three hundred eighty-five thousand, one hundred seventy-one".