1205189121 has 16 divisors (see below), whose sum is σ = 1677634560. Its totient is φ = 768137040.

The previous prime is 1205189113. The next prime is 1205189149. The reversal of 1205189121 is 1219815021.

It is not a de Polignac number, because 1205189121 - 2³ = 1205189113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205189191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202060 + ... + 207938.

It is an arithmetic number, because the mean of its divisors is an integer number (104852160).

Almost surely, 2^1205189121 is an apocalyptic number.

It is an amenable number.

1205189121 is a deficient number, since it is larger than the sum of its proper divisors (472445439).

1205189121 is a wasteful number, since it uses less digits than its factorization.

1205189121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8876.

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 1205189121 is about 34715.8338658313. The cubic root of 1205189121 is about 1064.1881065585.

The spelling of 1205189121 in words is "one billion, two hundred five million, one hundred eighty-nine thousand, one hundred twenty-one".