505809673 has 2 divisors, whose sum is σ = 505809674. Its totient is φ = 505809672.

The previous prime is 505809649. The next prime is 505809691. The reversal of 505809673 is 376908505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487173184 + 18636489 = 22072^2 + 4317^2 .

It is a cyclic number.

It is not a de Polignac number, because 505809673 - 2¹³ = 505801481 is a prime.

It is not a weakly prime, because it can be changed into another prime (505809173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252904836 + 252904837.

It is an arithmetic number, because the mean of its divisors is an integer number (252904837).

Almost surely, 2^505809673 is an apocalyptic number.

It is an amenable number.

505809673 is a deficient number, since it is larger than the sum of its proper divisors (1).

505809673 is an equidigital number, since it uses as much as digits as its factorization.

505809673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 505809673 is about 22490.2128269165. The cubic root of 505809673 is about 796.7627896093.

The spelling of 505809673 in words is "five hundred five million, eight hundred nine thousand, six hundred seventy-three".