51516550 has 24 divisors (see below), whose sum is σ = 99989136. Its totient is φ = 19710240.

The previous prime is 51516539. The next prime is 51516551. The reversal of 51516550 is 5561515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21249 + ... + 23548.

It is an arithmetic number, because the mean of its divisors is an integer number (4166214).

Almost surely, 2^51516550 is an apocalyptic number.

51516550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51516550 is a deficient number, since it is larger than the sum of its proper divisors (48472586).

51516550 is a wasteful number, since it uses less digits than its factorization.

51516550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44832 (or 44827 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51516550 is about 7177.5030477179. The cubic root of 51516550 is about 372.0907927692.

The spelling of 51516550 in words is "fifty-one million, five hundred sixteen thousand, five hundred fifty".