51205556 has 12 divisors (see below), whose sum is σ = 91795620. Its totient is φ = 24978240.

The previous prime is 51205549. The next prime is 51205577. The reversal of 51205556 is 65550215.

51205556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15085456 + 36120100 = 3884^2 + 6010^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 155951 + ... + 156278.

It is an arithmetic number, because the mean of its divisors is an integer number (7649635).

Almost surely, 2^51205556 is an apocalyptic number.

It is an amenable number.

51205556 is a deficient number, since it is larger than the sum of its proper divisors (40590064).

51205556 is a wasteful number, since it uses less digits than its factorization.

51205556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312274 (or 312272 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 51205556 is about 7155.8057547700. The cubic root of 51205556 is about 371.3405378009.

The spelling of 51205556 in words is "fifty-one million, two hundred five thousand, five hundred fifty-six".