206504621 has 8 divisors (see below), whose sum is σ = 215188920. Its totient is φ = 197924608.

The previous prime is 206504591. The next prime is 206504677. The reversal of 206504621 is 126405602.

It can be written as a sum of positive squares in 4 ways, for example, as 64561225 + 141943396 = 8035^2 + 11914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206504621 - 2²⁶ = 139395757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206500621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22016 + ... + 29961.

It is an arithmetic number, because the mean of its divisors is an integer number (26898615).

Almost surely, 2^206504621 is an apocalyptic number.

It is an amenable number.

206504621 is a deficient number, since it is larger than the sum of its proper divisors (8684299).

206504621 is a wasteful number, since it uses less digits than its factorization.

206504621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52143.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 206504621 is about 14370.2686474540. The cubic root of 206504621 is about 591.0759081117.

The spelling of 206504621 in words is "two hundred six million, five hundred four thousand, six hundred twenty-one".