51385871 has 4 divisors (see below), whose sum is σ = 51894744. Its totient is φ = 50877000.

The previous prime is 51385853. The next prime is 51385877. The reversal of 51385871 is 17858315.

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 51385871 - 2¹⁸ = 51123727 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 (51385877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254285 + ... + 254486.

It is an arithmetic number, because the mean of its divisors is an integer number (12973686).

Almost surely, 2^51385871 is an apocalyptic number.

51385871 is a deficient number, since it is larger than the sum of its proper divisors (508873).

51385871 is a wasteful number, since it uses less digits than its factorization.

51385871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508872.

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

The square root of 51385871 is about 7168.3938926373. The cubic root of 51385871 is about 371.7759060968.

The spelling of 51385871 in words is "fifty-one million, three hundred eighty-five thousand, eight hundred seventy-one".