505135849 has 4 divisors (see below), whose sum is σ = 505751940. Its totient is φ = 504519760.

The previous prime is 505135817. The next prime is 505135853. The reversal of 505135849 is 948531505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948531505 = 5 ⋅189706301.

It can be written as a sum of positive squares in 2 ways, for example, as 202549824 + 302586025 = 14232^2 + 17395^2 .

It is a cyclic number.

It is not a de Polignac number, because 505135849 - 2⁵ = 505135817 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505135249) 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, 306814 + ... + 308455.

It is an arithmetic number, because the mean of its divisors is an integer number (126437985).

Almost surely, 2^505135849 is an apocalyptic number.

It is an amenable number.

505135849 is a deficient number, since it is larger than the sum of its proper divisors (616091).

505135849 is an equidigital number, since it uses as much as digits as its factorization.

505135849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616090.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 505135849 is about 22475.2274515743. The cubic root of 505135849 is about 796.4088248018.

The spelling of 505135849 in words is "five hundred five million, one hundred thirty-five thousand, eight hundred forty-nine".