51555613 has 2 divisors, whose sum is σ = 51555614. Its totient is φ = 51555612.

The previous prime is 51555601. The next prime is 51555641. The reversal of 51555613 is 31655515.

51555613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51451929 + 103684 = 7173^2 + 322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51555613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51555643) by changing a digit.

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 as a sum of consecutive naturals, namely, 25777806 + 25777807.

It is an arithmetic number, because the mean of its divisors is an integer number (25777807).

Almost surely, 2^51555613 is an apocalyptic number.

It is an amenable number.

51555613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555613 is an equidigital number, since it uses as much as digits as its factorization.

51555613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11250, while the sum is 31.

The square root of 51555613 is about 7180.2237430320. The cubic root of 51555613 is about 372.1848163429.

The spelling of 51555613 in words is "fifty-one million, five hundred fifty-five thousand, six hundred thirteen".