51687371 has 4 divisors (see below), whose sum is σ = 53934672. Its totient is φ = 49440072.

The previous prime is 51687359. The next prime is 51687379. The reversal of 51687371 is 17378615.

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 51687371 - 2²² = 47493067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51687379) 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, 1123616 + ... + 1123661.

It is an arithmetic number, because the mean of its divisors is an integer number (13483668).

Almost surely, 2^51687371 is an apocalyptic number.

51687371 is a deficient number, since it is larger than the sum of its proper divisors (2247301).

51687371 is a wasteful number, since it uses less digits than its factorization.

51687371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247300.

The product of its digits is 35280, while the sum is 38.

The square root of 51687371 is about 7189.3929507296. The cubic root of 51687371 is about 372.5016044253.

The spelling of 51687371 in words is "fifty-one million, six hundred eighty-seven thousand, three hundred seventy-one".