205500001 has 8 divisors (see below), whose sum is σ = 234995904. Its totient is φ = 176038800.

The previous prime is 205499971. The next prime is 205500007. The reversal of 205500001 is 100005502.

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

It is not a de Polignac number, because 205500001 - 2¹¹ = 205497953 is a prime.

It is a super-2 number, since 2×205500001² = 84460500822000002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205500007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5586 + ... + 21028.

It is an arithmetic number, because the mean of its divisors is an integer number (29374488).

Almost surely, 2^205500001 is an apocalyptic number.

It is an amenable number.

205500001 is a deficient number, since it is larger than the sum of its proper divisors (29495903).

205500001 is a wasteful number, since it uses less digits than its factorization.

205500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17351.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 205500001 is about 14335.2712217105. The cubic root of 205500001 is about 590.1158452981.

Adding to 205500001 its reverse (100005502), we get a palindrome (305505503).

The spelling of 205500001 in words is "two hundred five million, five hundred thousand, one".