51809116 has 12 divisors (see below), whose sum is σ = 90756288. Its totient is φ = 25878752.

The previous prime is 51809111. The next prime is 51809129. The reversal of 51809116 is 61190815.

51809116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51809111) 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, 1516 + ... + 10291.

It is an arithmetic number, because the mean of its divisors is an integer number (7563024).

Almost surely, 2^51809116 is an apocalyptic number.

It is an amenable number.

51809116 is a deficient number, since it is larger than the sum of its proper divisors (38947172).

51809116 is a wasteful number, since it uses less digits than its factorization.

51809116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12908 (or 12906 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 51809116 is about 7197.8549582497. The cubic root of 51809116 is about 372.7938398873.

The spelling of 51809116 in words is "fifty-one million, eight hundred nine thousand, one hundred sixteen".