51008687 has 8 divisors (see below), whose sum is σ = 56357856. Its totient is φ = 45920512.

The previous prime is 51008669. The next prime is 51008693. The reversal of 51008687 is 78680015.

It is a happy number.

51008687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51008687 - 2⁶ = 51008623 is a prime.

It is a super-2 number, since 2×51008687² = 5203772298927938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51008887) 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 7 ways as a sum of consecutive naturals, for example, 64838 + ... + 65619.

It is an arithmetic number, because the mean of its divisors is an integer number (7044732).

Almost surely, 2^51008687 is an apocalyptic number.

51008687 is a deficient number, since it is larger than the sum of its proper divisors (5349169).

51008687 is a wasteful number, since it uses less digits than its factorization.

51008687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130497.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 51008687 is about 7142.0366142999. The cubic root of 51008687 is about 370.8640313714.

The spelling of 51008687 in words is "fifty-one million, eight thousand, six hundred eighty-seven".