51555601 has 2 divisors, whose sum is σ = 51555602. Its totient is φ = 51555600.

The previous prime is 51555589. The next prime is 51555613. The reversal of 51555601 is 10655515.

It is a balanced prime because it is at equal distance from previous prime (51555589) and next prime (51555613).

It can be written as a sum of positive squares in only one way, i.e., 41796225 + 9759376 = 6465^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 51555601 - 2⁷ = 51555473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51555601.

It is not a weakly prime, because it can be changed into another prime (51555641) 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 as a sum of consecutive naturals, namely, 25777800 + 25777801.

It is an arithmetic number, because the mean of its divisors is an integer number (25777801).

Almost surely, 2^51555601 is an apocalyptic number.

It is an amenable number.

51555601 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555601 is an equidigital number, since it uses as much as digits as its factorization.

51555601 is an odious number, because the sum of its binary digits is odd.

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

The square root of 51555601 is about 7180.2229074034. Note that the first 3 decimals coincide. The cubic root of 51555601 is about 372.1847874665.

The spelling of 51555601 in words is "fifty-one million, five hundred fifty-five thousand, six hundred one".