51218616 has 16 divisors (see below), whose sum is σ = 128046600. Its totient is φ = 17072864.

The previous prime is 51218597. The next prime is 51218659. The reversal of 51218616 is 61681215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067031 + ... + 1067078.

Almost surely, 2^51218616 is an apocalyptic number.

It is an amenable number.

51218616 is an abundant number, since it is smaller than the sum of its proper divisors (76827984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51218616 is a wasteful number, since it uses less digits than its factorization.

51218616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134118 (or 2134114 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 51218616 is about 7156.7182423231. The cubic root of 51218616 is about 371.3721053075.

The spelling of 51218616 in words is "fifty-one million, two hundred eighteen thousand, six hundred sixteen".