51985606 has 4 divisors (see below), whose sum is σ = 77978412. Its totient is φ = 25992802.

The previous prime is 51985601. The next prime is 51985631. The reversal of 51985606 is 60658915.

51985606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51985601) 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 as a sum of consecutive naturals, namely, 12996400 + ... + 12996403.

It is an arithmetic number, because the mean of its divisors is an integer number (19494603).

Almost surely, 2^51985606 is an apocalyptic number.

51985606 is a deficient number, since it is larger than the sum of its proper divisors (25992806).

51985606 is a wasteful number, since it uses less digits than its factorization.

51985606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25992805.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 51985606 is about 7210.1044375238. The cubic root of 51985606 is about 373.2166729102.

The spelling of 51985606 in words is "fifty-one million, nine hundred eighty-five thousand, six hundred six".