1205111211 has 8 divisors (see below), whose sum is σ = 1662222480. Its totient is φ = 775703712.

The previous prime is 1205111209. The next prime is 1205111251. The reversal of 1205111211 is 1121115021.

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

It is not a de Polignac number, because 1205111211 - 2¹ = 1205111209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205111251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6925840 + ... + 6926013.

It is an arithmetic number, because the mean of its divisors is an integer number (207777810).

Almost surely, 2^1205111211 is an apocalyptic number.

1205111211 is a deficient number, since it is larger than the sum of its proper divisors (457111269).

1205111211 is a wasteful number, since it uses less digits than its factorization.

1205111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13851885.

The product of its (nonzero) digits is 20, while the sum is 15.

The square root of 1205111211 is about 34714.7117372448. The cubic root of 1205111211 is about 1064.1651744226.

Adding to 1205111211 its reverse (1121115021), we get a palindrome (2326226232).

The spelling of 1205111211 in words is "one billion, two hundred five million, one hundred eleven thousand, two hundred eleven".