505494109 has 4 divisors (see below), whose sum is σ = 505564704. Its totient is φ = 505423516.

The previous prime is 505494103. The next prime is 505494139. The reversal of 505494109 is 901494505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 901494505 = 5 ⋅180298901.

It is a cyclic number.

It is not a de Polignac number, because 505494109 - 2⁷ = 505493981 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505494103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23167 + ... + 39340.

It is an arithmetic number, because the mean of its divisors is an integer number (126391176).

Almost surely, 2^505494109 is an apocalyptic number.

It is an amenable number.

505494109 is a deficient number, since it is larger than the sum of its proper divisors (70595).

505494109 is an equidigital number, since it uses as much as digits as its factorization.

505494109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70594.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 505494109 is about 22483.1961473452. The cubic root of 505494109 is about 796.5970606327.

The spelling of 505494109 in words is "five hundred five million, four hundred ninety-four thousand, one hundred nine".