205590001 has 4 divisors (see below), whose sum is σ = 206118900. Its totient is φ = 205061104.

The previous prime is 205589999. The next prime is 205590029. The reversal of 205590001 is 100095502.

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 130507776 + 75082225 = 11424^2 + 8665^2 .

It is a cyclic number.

It is not a de Polignac number, because 205590001 - 2¹ = 205589999 is a prime.

It is a super-2 number, since 2×205590001² = 84534497022360002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205590101) 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, 263866 + ... + 264643.

It is an arithmetic number, because the mean of its divisors is an integer number (51529725).

Almost surely, 2^205590001 is an apocalyptic number.

It is an amenable number.

205590001 is a deficient number, since it is larger than the sum of its proper divisors (528899).

205590001 is an equidigital number, since it uses as much as digits as its factorization.

205590001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528898.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 205590001 is about 14338.4099885587. The cubic root of 205590001 is about 590.2019810229.

The spelling of 205590001 in words is "two hundred five million, five hundred ninety thousand, one".