51659986 has 16 divisors (see below), whose sum is σ = 88753536. Its totient is φ = 22091616.

The previous prime is 51659977. The next prime is 51659989. The reversal of 51659986 is 68995615.

It is not an unprimeable number, because it can be changed into a prime (51659989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3030 + ... + 10606.

It is an arithmetic number, because the mean of its divisors is an integer number (5547096).

Almost surely, 2^51659986 is an apocalyptic number.

51659986 is a deficient number, since it is larger than the sum of its proper divisors (37093550).

51659986 is a wasteful number, since it uses less digits than its factorization.

51659986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073.

The product of its digits is 583200, while the sum is 49.

The square root of 51659986 is about 7187.4881565120. The cubic root of 51659986 is about 372.4358065439.

It can be divided in two parts, 5165 and 9986, that added together give a palindrome (15151).

The spelling of 51659986 in words is "fifty-one million, six hundred fifty-nine thousand, nine hundred eighty-six".