51681886 has 8 divisors (see below), whose sum is σ = 80196120. Its totient is φ = 24949848.

The previous prime is 51681871. The next prime is 51681893. The reversal of 51681886 is 68818615.

It is a happy number.

51681886 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 congruent number.

It is an unprimeable number.

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, 445476 + ... + 445591.

It is an arithmetic number, because the mean of its divisors is an integer number (10024515).

Almost surely, 2^51681886 is an apocalyptic number.

51681886 is a deficient number, since it is larger than the sum of its proper divisors (28514234).

51681886 is a wasteful number, since it uses less digits than its factorization.

51681886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891098.

The product of its digits is 92160, while the sum is 43.

The square root of 51681886 is about 7189.0114758567. The cubic root of 51681886 is about 372.4884274891.

The spelling of 51681886 in words is "fifty-one million, six hundred eighty-one thousand, eight hundred eighty-six".