204414509 has 4 divisors (see below), whose sum is σ = 220138716. Its totient is φ = 188690304.

The previous prime is 204414499. The next prime is 204414523. The reversal of 204414509 is 905414402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905414402 = 2 ⋅452707201.

It can be written as a sum of positive squares in 2 ways, for example, as 66422500 + 137992009 = 8150^2 + 11747^2 .

It is a cyclic number.

It is not a de Polignac number, because 204414509 - 2²⁰ = 203365933 is a prime.

It is a super-2 number, since 2×204414509² = 83570582979422162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204414569) 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, 7862084 + ... + 7862109.

It is an arithmetic number, because the mean of its divisors is an integer number (55034679).

Almost surely, 2^204414509 is an apocalyptic number.

It is an amenable number.

204414509 is a deficient number, since it is larger than the sum of its proper divisors (15724207).

204414509 is a wasteful number, since it uses less digits than its factorization.

204414509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15724206.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 204414509 is about 14297.3602108921. The cubic root of 204414509 is about 589.0749739058.

The spelling of 204414509 in words is "two hundred four million, four hundred fourteen thousand, five hundred nine".