205006601 has 4 divisors (see below), whose sum is σ = 210006804. Its totient is φ = 200006400.

The previous prime is 205006583. The next prime is 205006631. The reversal of 205006601 is 106600502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106600502 = 2 ⋅53300251.

It can be written as a sum of positive squares in 2 ways, for example, as 28090000 + 176916601 = 5300^2 + 13301^2 .

It is a cyclic number.

It is not a de Polignac number, because 205006601 - 2¹⁴ = 204990217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205006631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500040 + ... + 2500121.

It is an arithmetic number, because the mean of its divisors is an integer number (52501701).

Almost surely, 2^205006601 is an apocalyptic number.

It is an amenable number.

205006601 is a deficient number, since it is larger than the sum of its proper divisors (5000203).

205006601 is an equidigital number, since it uses as much as digits as its factorization.

205006601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000202.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 205006601 is about 14318.0515783398. The cubic root of 205006601 is about 589.6431826980.

The spelling of 205006601 in words is "two hundred five million, six thousand, six hundred one".