204400513 has 4 divisors (see below), whose sum is σ = 206385088. Its totient is φ = 202415940.

The previous prime is 204400507. The next prime is 204400523. The reversal of 204400513 is 315004402.

204400513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315004402 = 2 ⋅157502201.

It is a cyclic number.

It is not a de Polignac number, because 204400513 - 2¹⁷ = 204269441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204400523) 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, 992133 + ... + 992338.

It is an arithmetic number, because the mean of its divisors is an integer number (51596272).

Almost surely, 2^204400513 is an apocalyptic number.

It is an amenable number.

204400513 is a deficient number, since it is larger than the sum of its proper divisors (1984575).

204400513 is a wasteful number, since it uses less digits than its factorization.

204400513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984574.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 204400513 is about 14296.8707415294. The cubic root of 204400513 is about 589.0615291956.

Adding to 204400513 its reverse (315004402), we get a palindrome (519404915).

The spelling of 204400513 in words is "two hundred four million, four hundred thousand, five hundred thirteen".