205135613 has 4 divisors (see below), whose sum is σ = 205412448. Its totient is φ = 204858780.

The previous prime is 205135591. The next prime is 205135627. The reversal of 205135613 is 316531502.

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.

It is a cyclic number.

It is not a de Polignac number, because 205135613 - 2¹⁶ = 205070077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205135673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137303 + ... + 138788.

It is an arithmetic number, because the mean of its divisors is an integer number (51353112).

Almost surely, 2^205135613 is an apocalyptic number.

It is an amenable number.

205135613 is a deficient number, since it is larger than the sum of its proper divisors (276835).

205135613 is an equidigital number, since it uses as much as digits as its factorization.

205135613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276834.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 205135613 is about 14322.5560917037. The cubic root of 205135613 is about 589.7668455364.

The spelling of 205135613 in words is "two hundred five million, one hundred thirty-five thousand, six hundred thirteen".