550277561 has 2 divisors, whose sum is σ = 550277562. Its totient is φ = 550277560.

The previous prime is 550277557. The next prime is 550277587. The reversal of 550277561 is 165772055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 539121961 + 11155600 = 23219^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 550277561 - 2² = 550277557 is a prime.

It is not a weakly prime, because it can be changed into another prime (550277261) 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, 275138780 + 275138781.

It is an arithmetic number, because the mean of its divisors is an integer number (275138781).

Almost surely, 2^550277561 is an apocalyptic number.

It is an amenable number.

550277561 is a deficient number, since it is larger than the sum of its proper divisors (1).

550277561 is an equidigital number, since it uses as much as digits as its factorization.

550277561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73500, while the sum is 38.

The square root of 550277561 is about 23457.9956731175. The cubic root of 550277561 is about 819.4590726534.

The spelling of 550277561 in words is "five hundred fifty million, two hundred seventy-seven thousand, five hundred sixty-one".