550505261 has 2 divisors, whose sum is σ = 550505262. Its totient is φ = 550505260.

The previous prime is 550505243. The next prime is 550505269. The reversal of 550505261 is 162505055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373455625 + 177049636 = 19325^2 + 13306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550505261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550505269) 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, 275252630 + 275252631.

It is an arithmetic number, because the mean of its divisors is an integer number (275252631).

Almost surely, 2^550505261 is an apocalyptic number.

It is an amenable number.

550505261 is a deficient number, since it is larger than the sum of its proper divisors (1).

550505261 is an equidigital number, since it uses as much as digits as its factorization.

550505261 is an odious number, because the sum of its binary digits is odd.

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

The square root of 550505261 is about 23462.8485269798. The cubic root of 550505261 is about 819.5720853785.

The spelling of 550505261 in words is "five hundred fifty million, five hundred five thousand, two hundred sixty-one".