505561499 has 2 divisors, whose sum is σ = 505561500. Its totient is φ = 505561498.

The previous prime is 505561489. The next prime is 505561513. The reversal of 505561499 is 994165505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505561499 - 2²⁰ = 504512923 is a prime.

It is a super-2 number, since 2×505561499² = 511184858542254002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505561409) 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, 252780749 + 252780750.

It is an arithmetic number, because the mean of its divisors is an integer number (252780750).

Almost surely, 2^505561499 is an apocalyptic number.

505561499 is a deficient number, since it is larger than the sum of its proper divisors (1).

505561499 is an equidigital number, since it uses as much as digits as its factorization.

505561499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 505561499 is about 22484.6947722223. The cubic root of 505561499 is about 796.6324585332.

The spelling of 505561499 in words is "five hundred five million, five hundred sixty-one thousand, four hundred ninety-nine".