51651616 has 24 divisors (see below), whose sum is σ = 102682944. Its totient is φ = 25573440.

The previous prime is 51651599. The next prime is 51651623. The reversal of 51651616 is 61615615.

It is a super-2 number, since 2×51651616² = 5335778870822912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4540 + ... + 11131.

It is an arithmetic number, because the mean of its divisors is an integer number (4278456).

Almost surely, 2^51651616 is an apocalyptic number.

It is an amenable number.

51651616 is a deficient number, since it is larger than the sum of its proper divisors (51031328).

51651616 is a wasteful number, since it uses less digits than its factorization.

51651616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15784 (or 15776 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

The square root of 51651616 is about 7186.9058710964. The cubic root of 51651616 is about 372.4156913231.

The spelling of 51651616 in words is "fifty-one million, six hundred fifty-one thousand, six hundred sixteen".