1205211305 has 8 divisors (see below), whose sum is σ = 1452740352. Its totient is φ = 959844528.

The previous prime is 1205211289. The next prime is 1205211313. The reversal of 1205211305 is 5031125021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205211305 - 2⁴ = 1205211289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539339 + ... + 541568.

It is an arithmetic number, because the mean of its divisors is an integer number (181592544).

Almost surely, 2^1205211305 is an apocalyptic number.

It is an amenable number.

1205211305 is a deficient number, since it is larger than the sum of its proper divisors (247529047).

1205211305 is a wasteful number, since it uses less digits than its factorization.

1205211305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081135.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1205211305 is about 34716.1533727457. The cubic root of 1205211305 is about 1064.1946360466.

Adding to 1205211305 its reverse (5031125021), we get a palindrome (6236336326).

The spelling of 1205211305 in words is "one billion, two hundred five million, two hundred eleven thousand, three hundred five".