1205305135 has 4 divisors (see below), whose sum is σ = 1446366168. Its totient is φ = 964244104.

The previous prime is 1205305099. The next prime is 1205305139. The reversal of 1205305135 is 5315035021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1205305135 - 2¹³ = 1205296943 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 (1205305139) 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, 120530509 + ... + 120530518.

It is an arithmetic number, because the mean of its divisors is an integer number (361591542).

Almost surely, 2^1205305135 is an apocalyptic number.

1205305135 is a deficient number, since it is larger than the sum of its proper divisors (241061033).

1205305135 is an equidigital number, since it uses as much as digits as its factorization.

1205305135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241061032.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 1205305135 is about 34717.5047346436. The cubic root of 1205305135 is about 1064.2222524464. Note that the first 4 decimals are identical.

The spelling of 1205305135 in words is "one billion, two hundred five million, three hundred five thousand, one hundred thirty-five".