609809495409 has 15 divisors (see below), whose sum is σ = 910960485897. Its totient is φ = 406534978188.

The previous prime is 609809495371. The next prime is 609809495453. The reversal of 609809495409 is 904594908906.

The square root of 609809495409 is 780903.

It is a perfect power (a square), and thus also a powerful number.

609809495409 is a `hidden beast` number, since 6 + 0 + 9 + 80 + 9 + 4 + 9 + 540 + 9 = 666.

It is not a de Polignac number, because 609809495409 - 2¹¹ = 609809493361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (609809495909) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6984744 + ... + 7071510.

Almost surely, 2^609809495409 is an apocalyptic number.

609809495409 is the 780903-rd square number.

609809495409 is the 390452-nd centered octagonal number.

It is an amenable number.

609809495409 is a deficient number, since it is larger than the sum of its proper divisors (301150990488).

609809495409 is an frugal number, since it uses more digits than its factorization.

609809495409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173546 (or 86770 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 609809495409 in words is "six hundred nine billion, eight hundred nine million, four hundred ninety-five thousand, four hundred nine".