51556550 has 24 divisors (see below), whose sum is σ = 96087600. Its totient is φ = 20581280.

The previous prime is 51556541. The next prime is 51556553. The reversal of 51556550 is 5565515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51556553) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 41336 + ... + 42564.

It is an arithmetic number, because the mean of its divisors is an integer number (4003650).

Almost surely, 2^51556550 is an apocalyptic number.

51556550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51556550 is a deficient number, since it is larger than the sum of its proper divisors (44531050).

51556550 is a wasteful number, since it uses less digits than its factorization.

51556550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080 (or 2075 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 51556550 is about 7180.2889913986. The cubic root of 51556550 is about 372.1870710929.

The spelling of 51556550 in words is "fifty-one million, five hundred fifty-six thousand, five hundred fifty".