204000001 has 4 divisors (see below), whose sum is σ = 205035732. Its totient is φ = 202964272.

The previous prime is 203999989. The next prime is 204000011. The reversal of 204000001 is 100000402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100000402 = 2 ⋅50000201.

It can be written as a sum of positive squares in 2 ways, for example, as 177528976 + 26471025 = 13324^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 204000001 - 2¹¹ = 203997953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204000011) 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, 517570 + ... + 517963.

It is an arithmetic number, because the mean of its divisors is an integer number (51258933).

Almost surely, 2^204000001 is an apocalyptic number.

It is an amenable number.

204000001 is a deficient number, since it is larger than the sum of its proper divisors (1035731).

204000001 is a wasteful number, since it uses less digits than its factorization.

204000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035730.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 204000001 is about 14282.8568920927. The cubic root of 204000001 is about 588.6765326502.

Adding to 204000001 its reverse (100000402), we get a palindrome (304000403).

The spelling of 204000001 in words is "two hundred four million, one", and thus it is an aban number.