1205135205101 has 4 divisors (see below), whose sum is σ = 1208140530204. Its totient is φ = 1202129880000.

The previous prime is 1205135205059. The next prime is 1205135205137. The reversal of 1205135205101 is 1015025315021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1169644413001 + 35490792100 = 1081501^2 + 188390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205135205101 - 2¹⁴ = 1205135188717 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 (1205135205181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502661950 + ... + 1502662751.

It is an arithmetic number, because the mean of its divisors is an integer number (302035132551).

Almost surely, 2^{1205135205101} is an apocalyptic number.

It is an amenable number.

1205135205101 is a deficient number, since it is larger than the sum of its proper divisors (3005325103).

1205135205101 is an equidigital number, since it uses as much as digits as its factorization.

1205135205101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005325102.

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 1205135205101 in words is "one trillion, two hundred five billion, one hundred thirty-five million, two hundred five thousand, one hundred one".