51811516 has 24 divisors (see below), whose sum is σ = 94162320. Its totient is φ = 24915072.

The previous prime is 51811489. The next prime is 51811519. The reversal of 51811516 is 61511815.

51811516 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 (51811519) 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 7 ways as a sum of consecutive naturals, for example, 35595 + ... + 37021.

It is an arithmetic number, because the mean of its divisors is an integer number (3923430).

Almost surely, 2^51811516 is an apocalyptic number.

It is an amenable number.

51811516 is a deficient number, since it is larger than the sum of its proper divisors (42350804).

51811516 is a wasteful number, since it uses less digits than its factorization.

51811516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1771 counting only the distinct ones).

The product of its digits is 1200, while the sum is 28.

The square root of 51811516 is about 7198.0216726542. The cubic root of 51811516 is about 372.7995962192.

The spelling of 51811516 in words is "fifty-one million, eight hundred eleven thousand, five hundred sixteen".