495405209 has 4 divisors (see below), whose sum is σ = 533513316. Its totient is φ = 457297104.

The previous prime is 495405199. The next prime is 495405223. The reversal of 495405209 is 902504594.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172843609 + 322561600 = 13147^2 + 17960^2 .

It is a cyclic number.

It is not a de Polignac number, because 495405209 - 2⁸ = 495404953 is a prime.

It is a super-2 number, since 2×495405209² = 490852642208667362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (495405409) 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, 19054034 + ... + 19054059.

It is an arithmetic number, because the mean of its divisors is an integer number (133378329).

Almost surely, 2^495405209 is an apocalyptic number.

It is an amenable number.

495405209 is a deficient number, since it is larger than the sum of its proper divisors (38108107).

495405209 is a wasteful number, since it uses less digits than its factorization.

495405209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38108106.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 495405209 is about 22257.6999934854. The cubic root of 495405209 is about 791.2617816221.

The spelling of 495405209 in words is "four hundred ninety-five million, four hundred five thousand, two hundred nine".