204513502135 has 4 divisors (see below), whose sum is σ = 245416202568. Its totient is φ = 163610801704.

The previous prime is 204513502117. The next prime is 204513502169. The reversal of 204513502135 is 531205315402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 531205315402 = 2 ⋅265602657701.

It is a cyclic number.

It is not a de Polignac number, because 204513502135 - 2⁵ = 204513502103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204513502097 and 204513502106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20451350209 + ... + 20451350218.

It is an arithmetic number, because the mean of its divisors is an integer number (61354050642).

Almost surely, 2^204513502135 is an apocalyptic number.

204513502135 is a deficient number, since it is larger than the sum of its proper divisors (40902700433).

204513502135 is an equidigital number, since it uses as much as digits as its factorization.

204513502135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40902700432.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 204513502135 its reverse (531205315402), we get a palindrome (735718817537).

The spelling of 204513502135 in words is "two hundred four billion, five hundred thirteen million, five hundred two thousand, one hundred thirty-five".