51487171 has 4 divisors (see below), whose sum is σ = 51507144. Its totient is φ = 51467200.

The previous prime is 51487153. The next prime is 51487181. The reversal of 51487171 is 17178415.

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 51487171 - 2¹¹ = 51485123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51487181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5425 + ... + 11506.

It is an arithmetic number, because the mean of its divisors is an integer number (12876786).

Almost surely, 2^51487171 is an apocalyptic number.

51487171 is a deficient number, since it is larger than the sum of its proper divisors (19973).

51487171 is a wasteful number, since it uses less digits than its factorization.

51487171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19972.

The product of its digits is 7840, while the sum is 34.

The square root of 51487171 is about 7175.4561527474. The cubic root of 51487171 is about 372.0200469984.

The spelling of 51487171 in words is "fifty-one million, four hundred eighty-seven thousand, one hundred seventy-one".