51871853 has 6 divisors (see below), whose sum is σ = 57016302. Its totient is φ = 47156120.

The previous prime is 51871849. The next prime is 51871871. The reversal of 51871853 is 35817815.

It can be written as a sum of positive squares in only one way, i.e., 41126569 + 10745284 = 6413^2 + 3278^2 .

It is not a de Polignac number, because 51871853 - 2² = 51871849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51871823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214226 + ... + 214467.

It is an arithmetic number, because the mean of its divisors is an integer number (9502717).

Almost surely, 2^51871853 is an apocalyptic number.

It is an amenable number.

51871853 is a deficient number, since it is larger than the sum of its proper divisors (5144449).

51871853 is a wasteful number, since it uses less digits than its factorization.

51871853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428715 (or 428704 counting only the distinct ones).

The product of its digits is 33600, while the sum is 38.

The square root of 51871853 is about 7202.2116742012. The cubic root of 51871853 is about 372.9442544277.

The spelling of 51871853 in words is "fifty-one million, eight hundred seventy-one thousand, eight hundred fifty-three".