51317878 has 8 divisors (see below), whose sum is σ = 79631280. Its totient is φ = 24774120.

The previous prime is 51317873. The next prime is 51317881. The reversal of 51317878 is 87871315.

It is a happy number.

51317878 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 a self number, because there is not a number n which added to its sum of digits gives 51317878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51317873) 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 3 ways as a sum of consecutive naturals, for example, 442338 + ... + 442453.

It is an arithmetic number, because the mean of its divisors is an integer number (9953910).

Almost surely, 2^51317878 is an apocalyptic number.

51317878 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51317878 is a deficient number, since it is larger than the sum of its proper divisors (28313402).

51317878 is a wasteful number, since it uses less digits than its factorization.

51317878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884822.

The product of its digits is 47040, while the sum is 40.

The square root of 51317878 is about 7163.6497681001. The cubic root of 51317878 is about 371.6118576523.

The spelling of 51317878 in words is "fifty-one million, three hundred seventeen thousand, eight hundred seventy-eight".