51807971 has 4 divisors (see below), whose sum is σ = 52657344. Its totient is φ = 50958600.

The previous prime is 51807929. The next prime is 51807979. The reversal of 51807971 is 17970815.

51807971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51807971 - 2¹⁸ = 51545827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51807979) 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 in 3 ways as a sum of consecutive naturals, for example, 424595 + ... + 424716.

It is an arithmetic number, because the mean of its divisors is an integer number (13164336).

Almost surely, 2^51807971 is an apocalyptic number.

51807971 is a deficient number, since it is larger than the sum of its proper divisors (849373).

51807971 is an equidigital number, since it uses as much as digits as its factorization.

51807971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849372.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 51807971 is about 7197.7754202253. The cubic root of 51807971 is about 372.7910935746.

The spelling of 51807971 in words is "fifty-one million, eight hundred seven thousand, nine hundred seventy-one".