605555261 has 2 divisors, whose sum is σ = 605555262. Its totient is φ = 605555260.

The previous prime is 605555239. The next prime is 605555287. The reversal of 605555261 is 162555506.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346667161 + 258888100 = 18619^2 + 16090^2 .

It is a cyclic number.

It is not a de Polignac number, because 605555261 - 2¹⁰ = 605554237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (605555761) 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, 302777630 + 302777631.

It is an arithmetic number, because the mean of its divisors is an integer number (302777631).

Almost surely, 2^605555261 is an apocalyptic number.

It is an amenable number.

605555261 is a deficient number, since it is larger than the sum of its proper divisors (1).

605555261 is an equidigital number, since it uses as much as digits as its factorization.

605555261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 605555261 is about 24608.0324487757. The cubic root of 605555261 is about 846.0277219127.

It can be divided in two parts, 6055 and 55261, that added together give a palindrome (61316).

The spelling of 605555261 in words is "six hundred five million, five hundred fifty-five thousand, two hundred sixty-one".