505549999 has 2 divisors, whose sum is σ = 505550000. Its totient is φ = 505549998.

The previous prime is 505549973. The next prime is 505550027. The reversal of 505549999 is 999945505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505549999 - 2¹¹ = 505547951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505549939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252774999 + 252775000.

It is an arithmetic number, because the mean of its divisors is an integer number (252775000).

Almost surely, 2^505549999 is an apocalyptic number.

505549999 is a deficient number, since it is larger than the sum of its proper divisors (1).

505549999 is an equidigital number, since it uses as much as digits as its factorization.

505549999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3280500, while the sum is 55.

The square root of 505549999 is about 22484.4390412570. The cubic root of 505549999 is about 796.6264181585.

The spelling of 505549999 in words is "five hundred five million, five hundred forty-nine thousand, nine hundred ninety-nine".